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Full-Text Articles in Psychology

A Meta-Analytical Integration Of Over 40 Years Of Research On Diversity Training Evaluation, Katerina Bezrukova, Chester S. Spell, Jamie L. Perry, Karen A. Jehn May 2017

A Meta-Analytical Integration Of Over 40 Years Of Research On Diversity Training Evaluation, Katerina Bezrukova, Chester S. Spell, Jamie L. Perry, Karen A. Jehn

Jamie Perry

This meta-analysis of 260 independent samples assessed the effects of diversity training on 4 training outcomes over time and across characteristics of training context, design, and participants. Models from the training literature and psychological theory on diversity were used to generate theory-driven predictions. The results revealed an overall effect size (Hedges g) of .38 with the largest effect being for reactions to training and cognitive learning; smaller effects were found for behavioral and attitudinal/affective learning. Whereas the effects of diversity training on reactions and attitudinal/affective learning decayed over time, training effects on cognitive learning remained stable and even increased in …


Cross-Cultural Adaptation, Validation And Reliability Of The Brazilian Version Of The Richmond Compulsive Buying Scale, Priscilla Leite, Bernard Range, Monika Kukar-Kinney, Nancy Ridgway, Kent Monroe, Rodolfo Ribas Jr., J. Landeira-Fernandez, Antonio Egidio Nardi, Adriana Silva Jun 2015

Cross-Cultural Adaptation, Validation And Reliability Of The Brazilian Version Of The Richmond Compulsive Buying Scale, Priscilla Leite, Bernard Range, Monika Kukar-Kinney, Nancy Ridgway, Kent Monroe, Rodolfo Ribas Jr., J. Landeira-Fernandez, Antonio Egidio Nardi, Adriana Silva

Nancy Ridgway

Objective: To present the process of transcultural adaptation of the Richmond Compulsive Buying Scale to Brazilian Portuguese. Methods: For the semantic adaptation step, the scale was translated to Portuguese and then back-translated to English by two professional translators and one psychologist, without any communication between them. The scale was then applied to 20 participants from the general population for language adjustments. For the construct validation step, an exploratory factor analysis was performed, using the scree plot test, principal component analysis for factor extraction, and Varimax rotation. For convergent validity, the correlation matrix was analyzed through Pearson’s coefficient. Results: The scale …


Integrated Analysis Of Content And Construct Validity, Byron Gajewski, Larry Price, Valorie Coffland, Diane Boyle, Marjorie Bott Apr 2015

Integrated Analysis Of Content And Construct Validity, Byron Gajewski, Larry Price, Valorie Coffland, Diane Boyle, Marjorie Bott

Diane Kay Boyle PhD, RN, FAAN

Establishing adequacy of psychometric properties of an instrument involves acquisition and evaluation of evidence based on item content and internal structure. Content validity evidence consists of subject matter experts providing quantitative ratings of the extent to which items are a representative sample of targeted domain. Evidence of internal structure includes factor analytic studies and examination of item interrelationships based on item responses from participants. Although subject matter expert ratings and participant response data are traditionally analyzed separately, each serves to inform the other in important ways. We propose integrating subject matter experts’ and participants’ data seamlessly to establish a unified …


Measuring The Outliers: An Introduction To Out-Of-Level Testing With High-Achieving Students, Karen Rambo-Hernandez, Russell Warne Feb 2015

Measuring The Outliers: An Introduction To Out-Of-Level Testing With High-Achieving Students, Karen Rambo-Hernandez, Russell Warne

Russell T Warne

Out-of-level testing is an underused strategy for addressing the needs of students who score in the extremes, and when used wisely, it could provide educators with a much more accurate picture of what students know. Out-of-level testing has been shown to be an effective assessment strategy with high-achieving students; however, out-of-level testing has not been shown to work well with low-achieving students. This article provides a brief history of out-of-level testing, along with guidelines for using it.


Faster Than The Speed Of Rejection: Object Identification Processes During Visual Search For Multiple Targets, Hayward J. Godwin, Stephen Walenchok, Joseph W. Houpt, Michael C. Hout, Stephen D. Goldinger Jan 2015

Faster Than The Speed Of Rejection: Object Identification Processes During Visual Search For Multiple Targets, Hayward J. Godwin, Stephen Walenchok, Joseph W. Houpt, Michael C. Hout, Stephen D. Goldinger

Joseph W. Houpt

When engaged in a visual search for two targets, participants are slower and less accurate in their responses, relative to their performance when searching for singular targets. Previous work on this “dual-target cost” has primarily focused on the breakdown of attention guidance when looking for two items. Here, we investigated how object identification processes are affected by dual-target search. Our goal was to chart the speed at which distractors could be rejected, in order to assess whether dual-target search impairs object identification. To do so, we examined the capacity coefficient, which measures the speed at which decisions can be made, …


Can Two Dots Form A Gestalt? Measuring Emergent Features With The Capacity Coefficient, Robert X.D. Hawkins, Joseph W. Houpt, Ami Eidels, James T. Townsend Jan 2015

Can Two Dots Form A Gestalt? Measuring Emergent Features With The Capacity Coefficient, Robert X.D. Hawkins, Joseph W. Houpt, Ami Eidels, James T. Townsend

Joseph W. Houpt

While there is widespread agreement among vision researchers on the importance of some local aspects of visual stimuli, such as hue and intensity, there is no general consensus on a full set of basic sources of information used in perceptual tasks. Gestalt theories place particular value on emergent features, which are based on the higher-order relationships among elements of a stimulus rather than local properties. Thus, arbitrating between different accounts of features is an important step in arbitrating between local and Gestalt theories of perception in general. In this paper, we present the capacity coefficient from Systems Factorial Technology (SFT) …


Working Memory’S Workload Capacity, Andrew Heathcote, James R. Coleman, Ami Eidels, Jason M. Watson, Joseph W. Houpt, David L. Strayer Jan 2015

Working Memory’S Workload Capacity, Andrew Heathcote, James R. Coleman, Ami Eidels, Jason M. Watson, Joseph W. Houpt, David L. Strayer

Joseph W. Houpt

We examined the role of dual-task interference in working memory using a novel dual 2-back task that requires a redundant-target response (i.e., that neither the auditory nor visual stimulus occurred two back vs. one or both occurred two back) on every trial. Comparisons with performance on single 2 back trials (i.e., with only auditory or only visual stimuli) showed dual-task demands reduced both speed and accuracy. Our task design enabled a novel application of Townsend and Nozawa’s (1995) workload capacity measure, which revealed that the decrement in dual 2-back performance was mediated by sharing of a limited amount of processing …


Simulating Univariate And Multivariate Nonnormal Distributions Through The Method Of Percentiles, Jennifer Koran, Todd C. Headrick, Tzu Chun Kuo Dec 2014

Simulating Univariate And Multivariate Nonnormal Distributions Through The Method Of Percentiles, Jennifer Koran, Todd C. Headrick, Tzu Chun Kuo

Todd Christopher Headrick

This article derives a standard normal-based power method polynomial transformation for Monte Carlo simulation studies, approximating distributions, and fitting distributions to data based on the method of percentiles. The proposed method is used primarily when (1) conventional (or L) moment-based estimators such as skew (or L-skew) and kurtosis (or L -kurtosis) are unknown or (2) data are unavailable but percentiles are known (e.g., standardized test score reports). The proposed transformation also has the advantage that solutions to polynomial coefficients are available in simple closed form and thus obviates numerical equation solving. A procedure is also described for simulating power method …


Exploring The Various Interpretations Of "Test Bias", Russell Warne, Myeongsun Yoon, Chris Price Sep 2014

Exploring The Various Interpretations Of "Test Bias", Russell Warne, Myeongsun Yoon, Chris Price

Russell T Warne

Test bias is a hotly debated topic in society, especially as it relates to diverse groups of examinees who often score low on standardized tests. However, the phrase “test bias” has a multitude of interpretations that many people are not aware of. In this article, we explain five different meanings of “test bias” and summarize the empirical and theoretical evidence related to each interpretation. The five meanings are as follows: (a) mean group differences, (b) differential predictive validity, (c) differential item functioning, (d) differing factor structures of tests, and (e) unequal consequences of test use for various groups. We explain …


Theories Of Reasoned Action And Planned Behavior As Models Of Condom Use: A Meta-Analysis, Dolores Albarracín, Blair Johnson, Martin Fishbein, Paige Muellerleile Aug 2014

Theories Of Reasoned Action And Planned Behavior As Models Of Condom Use: A Meta-Analysis, Dolores Albarracín, Blair Johnson, Martin Fishbein, Paige Muellerleile

Blair T. Johnson

No abstract provided.


Interactions Of Borderline Personality Disorder And Mood Disorders Over Ten Years, John G. Gunderson, Robert L. Stout, M. Tracie Shea, Carlos M. Grilo, John C. Markowitz, Leslie C. Morey, Charles A. Sanislow, Shirley Yen, Mary C. Zanarini, Alex S. Keuroghlian, Thomas H. Mcglashan, Andrew E. Skodol Jul 2014

Interactions Of Borderline Personality Disorder And Mood Disorders Over Ten Years, John G. Gunderson, Robert L. Stout, M. Tracie Shea, Carlos M. Grilo, John C. Markowitz, Leslie C. Morey, Charles A. Sanislow, Shirley Yen, Mary C. Zanarini, Alex S. Keuroghlian, Thomas H. Mcglashan, Andrew E. Skodol

Charles A. Sanislow, Ph.D.

Objective: To examine the relationship of borderline personality disorder (BPD) to mood disorders by using data from the Collaborative Longitudinal Personality Disorders Study on the reciprocal interactions of BPD with both depressive and bipolar disorders over the course of 10 years.

Method: The study included 223 BPD patients with DSM-IV–defined co-occurring major depressive disorder (MDD) (n = 161), bipolar I disorder (n = 34), and bipolar II disorder (n = 28) who were reliably and prospectively assessed over a period of 10 years between 1997 and 2009. Proportional hazards regression analyses were used to assess the effects of improvement or …


An Alternative To Cronbach's Alpha: An L-Moment-Based Measure Of Internal-Consistency Reliablilty, Todd C. Headrick, Yanyan Sheng Feb 2014

An Alternative To Cronbach's Alpha: An L-Moment-Based Measure Of Internal-Consistency Reliablilty, Todd C. Headrick, Yanyan Sheng

Todd Christopher Headrick

Data sets in the social and behavioral sciences are often small or heavy-tailed. Previous studies have demonstrated that small samples or leptokurtic distributions adversely affect the performance of Cronbach’s coefficient alpha. To address these concerns, we propose an alternative estimator of reliability based on L-comoments. The empirical results of this study demonstrate that when sample sizes are small and distributions are heavy-tailed that the proposed coefficient L-alpha has substantial advantages over the conventional Cronbach estimator of reliability in terms of relative bias and relative standard error.


A New Perspective On Visual Word Processing Efficiency, Joseph W. Houpt, James T. Townsend, Christopher Donkin Jan 2014

A New Perspective On Visual Word Processing Efficiency, Joseph W. Houpt, James T. Townsend, Christopher Donkin

Joseph W. Houpt

As a fundamental part of our daily lives, visual word processing has received much attention in the psychological literature. Despite the well established advantage of perceiving letters in a word or in a pseudoword over letters alone or in random sequences using accuracy, a comparable effect using response times has been elusive. Some researchers continue to question whether the advantage due to word context is perceptual. We use the capacity coefficient, a well established, response time based measure of efficiency to provide evidence of word processing as a particularly efficient perceptual process to complement those results from the accuracy domain.


Using Above-Level Testing To Track Growth In Academic Achievement In Gifted Students, Russell Warne Dec 2013

Using Above-Level Testing To Track Growth In Academic Achievement In Gifted Students, Russell Warne

Russell T Warne

Above-level testing is the practice of administering aptitude or academic achievement tests that are designed for typical students in higher grades or older age-groups to gifted or high-achieving students. Although widely accepted in gifted education, above-level testing has not been subject to careful psychometric scrutiny. In this study, I examine reliability data, growth trajectories, distributions, and group differences of above-level test scores obtained from the Iowa Tests of Basic Skills and Iowa Tests of Educational Development. Two hundred twenty-four middle school students participated in this study. All participants were tested at least 1 time for an overall total of 435 …


Rasch Maximum Likelihood Estimation For Theta And W-Scores With Panel Study Of Income Dynamics Woodcock-Johnson Revised Achievement Raw Scores, Ezekiel J. Dixon-Román Dec 2013

Rasch Maximum Likelihood Estimation For Theta And W-Scores With Panel Study Of Income Dynamics Woodcock-Johnson Revised Achievement Raw Scores, Ezekiel J. Dixon-Román

Ezekiel J Dixon-Román

This appendix explains the estimation of the Rasch maximum likelihood estimated thetas using the raw scores of the Woodcock-Johnson Revised Achievement Measure in the Panel Study of Income Dynamics. It is then discussed how to estimate the W-scores from the Rasch maximum likelihood estimated thetas. The W-scores ensure stability in score changes that accounts for item difficulty and person ability for growth modeling.


Socioeconomic-Status And Mental Health In A Personality Disorder Sample: The Importance Of Neighborhood Factors, Zach Walsh, M. Tracie Shea, Shirley Yen, Emily B. Ansell, Carlos M. Grilo, Thomas H. Mcglashan, Robert L. Stout, Donna S. Bender, Andrew E. Skodol, Charles A. Sanislow, Leslie C. Morey, John G. Gunderson Dec 2013

Socioeconomic-Status And Mental Health In A Personality Disorder Sample: The Importance Of Neighborhood Factors, Zach Walsh, M. Tracie Shea, Shirley Yen, Emily B. Ansell, Carlos M. Grilo, Thomas H. Mcglashan, Robert L. Stout, Donna S. Bender, Andrew E. Skodol, Charles A. Sanislow, Leslie C. Morey, John G. Gunderson

Charles A. Sanislow, Ph.D.

This cross-sectional study examined the associations between neighborhood-level socioeconomic-status (NSES), and psychosocial functioning and personality pathology among 335 adults drawn from the Collaborative Longitudinal Personality Disorders Study. Participants belonged to four personality disorder (PD) diagnostic groups: Avoidant, Borderline, Schizotypal, and Obsessive Compulsive. Global functioning, social adjustment, and PD symptoms were assessed following a minimum two-year period of residential stability. Residence in higher-risk neighborhoods was associated with more PD symptoms and lower levels of functioning and social adjustment. These relationships were consistent after controlling for individual-level socioeconomic-status and ethnicity; however, the positive association between neighborhood-level socio-economic risk and PD symptoms was …


The Last Truth To Determine But The First To Consider: Navigating Negative Response Distortion On The Pai In A Forensic Context, Jacqueline Yoxall, Mark Bahr, Norman Barling Sep 2013

The Last Truth To Determine But The First To Consider: Navigating Negative Response Distortion On The Pai In A Forensic Context, Jacqueline Yoxall, Mark Bahr, Norman Barling

Mark Bahr

Negative response distortion must be a consideration for any psychologist endeavouring to measure reported psychopathology in populations for whom there exists an external incentive for a diagnosis. The Personality Assessment Inventory (Morey, 1991) is increasingly being used in psychological assessment in the forensic arena. This paper presents an overview of the validation of the negative validity indices of the PAI to interpret data from a recent archival file review of 400 individuals who participated in assessment as part of a compensation claim process or in preparation for criminal sentencing. Whilst malingering must be a standard consideration in any forensic assessment, …


Development Of A New Measure Of Adolescent Depression, Mona Taouk, Mark Bahr Sep 2013

Development Of A New Measure Of Adolescent Depression, Mona Taouk, Mark Bahr

Mark Bahr

A new scale to measure adolescent depression was developed by reviewing literature of adolescent depression, and an examination of existing depression instruments for both adults and adolescents. The Taouk Adolescent Depression Scale (TADS) was constructed as a multidimensional measure of depression, evaluated using a sample of 263 undergraduate and secondary school students (70 males, 193 females) aged between 12 and 21 years (M=15.53, SD=2.35). Four reliable factors comparable to those identified in previous research were obtained from an obliquely rotated principal axis factoring extraction, resulting in a final 20 item instrument with five items per domain, illustrating construct validity. The …


Convergent And Incremental Predictive Validity Of Clinician, Self-Report, And Structured Interview Diagnoses For Personality Disorders Over 5 Years, Douglas B. Samuel, Charles A. Sanislow, Christopher J. Hopwood, M. Tracie Shea, Andrew E. Skodol, Leslie C. Morey, Emily B. Ansell, John C. Markowitz, Mary C. Zanarini, Carlos M. Grilo Aug 2013

Convergent And Incremental Predictive Validity Of Clinician, Self-Report, And Structured Interview Diagnoses For Personality Disorders Over 5 Years, Douglas B. Samuel, Charles A. Sanislow, Christopher J. Hopwood, M. Tracie Shea, Andrew E. Skodol, Leslie C. Morey, Emily B. Ansell, John C. Markowitz, Mary C. Zanarini, Carlos M. Grilo

Charles A. Sanislow, Ph.D.

OBJECTIVE: Research has demonstrated poor agreement between clinician-assigned personality disorder (PD) diagnoses and those generated by self-report questionnaires and semistructured diagnostic interviews. No research has compared prospectively the predictive validity of these methods. We investigated the convergence of these 3 diagnostic methods and tested their relative and incremental validity in predicting independent, multimethod assessments of psychosocial functioning performed prospectively over 5 years.

METHOD: Participants were 320 patients in the Collaborative Longitudinal Personality Disorders Study diagnosed with PDs by therapist, self-report, and semistructured interview at baseline. We examined the relative incremental validity of therapists' naturalistic ratings relative to these other diagnostic …


Individuals With Single Versus Multiple Suicide Attempts Over 10 Years Of Prospective Follow-Up, Christina L. Boisseaua, Shirley Yen, John C. Markowitz, Carlos M. Grilo, Charles A. Sanislow, M. Tracie Shea, Mary C. Zanarini, Andrew E. Skodol, John G. Gunderson, Leslie C. Morey, Thomas H. Mcglashan Mar 2013

Individuals With Single Versus Multiple Suicide Attempts Over 10 Years Of Prospective Follow-Up, Christina L. Boisseaua, Shirley Yen, John C. Markowitz, Carlos M. Grilo, Charles A. Sanislow, M. Tracie Shea, Mary C. Zanarini, Andrew E. Skodol, John G. Gunderson, Leslie C. Morey, Thomas H. Mcglashan

Charles A. Sanislow, Ph.D.

Background: The study attempted to identify characteristics that differentiate multiple suicide attempters from single attempters in individuals with personality disorders (PDs) and/or major depression.

Method: Participants were 431 participants enrolled in the Collaborative Longitudinal Study of Personality Disorders from July 1996 to June 2008. Suicide attempts were assessed with the Longitudinal Interval Follow-up Evaluation at 6 and 12months, then yearly through 10years. Logistic regression was used to compare single attempters to multiple attempters on Axis I and II psychiatric disorders and personality trait variables.

Results: Twenty-one percent of participants attempted suicide during the 10years of observation, with 39 (9.0%) reporting …


Systems Factorial Technology With R, Joseph W. Houpt, Leslie M. Blaha, John P. Mcintire, Paul R. Havig, James T. Townsend Jan 2013

Systems Factorial Technology With R, Joseph W. Houpt, Leslie M. Blaha, John P. Mcintire, Paul R. Havig, James T. Townsend

Joseph W. Houpt

Systems Factorial Technology (SFT) comprises a set of powerful nonparametric models and measures, together with a theory-driven experiment methodology termed the Double Factorial Paradigm (DFP), for assessing the cognitive information processing mechanisms supporting the processing of multiple sources of information in a given task. We provide an overview of the model-based measures of SFT together with a tutorial on designing a DFP experiment to take advantage of all SFT measures in a single experiment. Illustrative examples are given to highlight the breadth of applicability of these techniques across psychology. We further introduce and demonstrate a new package for performing SFT …


Planning Impairments In Schizophrenia: Specificity, Task Independence And Functional Relevance, Daniel V. Holt, Jürgen Wolf, Joachim Funke, Matthias Weisbrod, Stefan Kaiser Dec 2012

Planning Impairments In Schizophrenia: Specificity, Task Independence And Functional Relevance, Daniel V. Holt, Jürgen Wolf, Joachim Funke, Matthias Weisbrod, Stefan Kaiser

Joachim Funke

The present study investigated the specificity of planning impairments in schizophrenia compared to unipolar major depression. Multiple measures of planning ability were employed to assess the task independence of a planning deficit. Furthermore, the predictive power of planning ability with regard to functional outcome was analyzed. A total of 80 participants completed a comprehensive neuropsychological assessment with an emphasis on executive functions and planning ability. The sample consisted of 28 patients with schizophrenia, 28 patients with depression and 24 healthy controls. Both patient groups were impaired on measures of attention, working memory and planning, but only planning ability differentiated between …


Computer-Based Assessment Of Complex Problem Solving: Concept, Implementation, And Application, Samuel Greiff, Daniel V. Holt, Sascha Wüstenberg, Frank Goldhammer, Joachim Funke Dec 2012

Computer-Based Assessment Of Complex Problem Solving: Concept, Implementation, And Application, Samuel Greiff, Daniel V. Holt, Sascha Wüstenberg, Frank Goldhammer, Joachim Funke

Joachim Funke

Complex Problem Solving (CPS) skills are essential to successfully deal with environments that change dynamically and involve a large number of interconnected and partially unknown causal influences. The increasing importance of such skills in the 21st century requires appropriate assessment and intervention methods, which in turn rely on adequate item construction, delivery, and scoring. The lack of assessment tools, however, has slowed down research on and understanding of CPS. This paper first presents the MicroDYN framework for assessing CPS, which is based on linear structural equation systems with input and output variables and opaque relations among them. Second, a versatile …


The Smallest Upper Bound For The Pth Absolute Central Moment Of A Class Of Random Variables, Martin Egozcue, Luis Fuentes García, Wing Keung Wong, Ricardas Zitikis Dec 2012

The Smallest Upper Bound For The Pth Absolute Central Moment Of A Class Of Random Variables, Martin Egozcue, Luis Fuentes García, Wing Keung Wong, Ricardas Zitikis

Martin Egozcue

We establish the smallest upper bound for the p absolute central moment over the class of all random variables with values in a compact interval. Numerical values of the bound are calculated for the first ten integer values of p, and its asymptotic behaviour derived when p tends to infinity. In addition, we establish an analogous bound in the case of all symmetric random variables with values in a compact interval. Such results play a role in a number of areas including actuarial science, economics, finance, operations research, and reliability.


An Optimal Strategy For Maximizing The Expected Real- Estate Selling Price: Accept Or Reject An Offer?, Martin Egozcue, Luis Fuentes García, Ricardas Zitikis Dec 2012

An Optimal Strategy For Maximizing The Expected Real- Estate Selling Price: Accept Or Reject An Offer?, Martin Egozcue, Luis Fuentes García, Ricardas Zitikis

Martin Egozcue

Motivated by a real-life situation, we put forward a model and then derive an optimal strategy that maximizes the expected real-estate selling price when one of the only two remaining buyers has already made an offer but the other one is yet to make. Since the seller is not sure whether the other buyer would make a lower or higher offer, and given no recall, the seller needs a strategy to decide whether to accept or reject the first-come offer. The herein derived optimal seller's strategy, which maximizes the expected selling price, is illustrated under several scenarios, such as independent …


Capacity Coefficient Variations, Joseph W. Houpt, Andrew Heathcote, Ami Eidels, Nathan Medeiros-Ward, Jason Watson, David Strayer Nov 2012

Capacity Coefficient Variations, Joseph W. Houpt, Andrew Heathcote, Ami Eidels, Nathan Medeiros-Ward, Jason Watson, David Strayer

Joseph W. Houpt

The capacity coefficient has become an increasingly popular measure of efficiency under changes in workload. It has been used in applications ranging from psychophysical detection tasks to complex cognitive tasks, as well as in addressing questions in social and clinical psychology. The basic formulation compares response times to each stimulus property (or task) in isolation to response times with all stimulus properties (or tasks) at the same time. A number of variations on the basic capacity coefficient have been used, both in the experimental design and in the calculations, and many more are possible. Here we outline the theoretical reasons …


General Recognition Theory Extended To Include Response Times: Predictions For A Class Of Parallel Systems, Joseph W. Houpt, James T. Townsend, Noah H. Silbert Nov 2012

General Recognition Theory Extended To Include Response Times: Predictions For A Class Of Parallel Systems, Joseph W. Houpt, James T. Townsend, Noah H. Silbert

Joseph W. Houpt

No abstract provided.


Convex Combinations Of Quadrant Dependent Copulas, Martin Egozcue, Luis Fuentes García, Wing Wong, Ricardas Zitikis Nov 2012

Convex Combinations Of Quadrant Dependent Copulas, Martin Egozcue, Luis Fuentes García, Wing Wong, Ricardas Zitikis

Martin Egozcue

It is well known that quadrant dependent (QD) random variables are also quadrant dependent in expectation (QDE). Recent literature has offered examples rigorously establishing the fact that there are QDE random variables which are not QD. The examples are based on convex combinations of specially chosen QD copulas: one negatively QD and another positively QD. In this paper we establish general results that determine when convex combinations of arbitrary QD copulas give rise to negatively or positively QD/QDE copulas. In addition to being an interesting mathematical exercise, the established results are helpful when modeling insurance and financial portfolios.


Integration–Segregation Decisions Under General Value Functions: ‘Create Your Own Bundle—Choose 1, 2 Or All 3!’, Martin Egozcue, Sebastien Massoni, Wing Wong, Ricardas Zitkiks Sep 2012

Integration–Segregation Decisions Under General Value Functions: ‘Create Your Own Bundle—Choose 1, 2 Or All 3!’, Martin Egozcue, Sebastien Massoni, Wing Wong, Ricardas Zitkiks

Martin Egozcue

Whether to keep products segregated (e.g., unbundled) or integrate some or all of them (e.g., bundle) has been a problem of profound interest in areas such as portfolio theory in finance, risk capital allocations in insurance and marketing of consumer products. Such decisions are inherently complex and depend on factors such as the underlying product values and consumer preferences, the latter being frequently described using value functions, also known as utility functions in economics. In this paper, we develop decision rules for multiple products, which we generally call ‘exposure units’ to naturally cover manifold scenarios spanning well beyond ‘products’. Our …


Gains From Diversification: A Regret Theory Approach, Martin Egozcue Aug 2012

Gains From Diversification: A Regret Theory Approach, Martin Egozcue

Martin Egozcue

No abstract provided.