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Full-Text Articles in Physical Sciences and Mathematics
Using Functional Data Analysis To Evaluate Effect Of Shade On Body Temperature Of Feedlot Heifers During Environmental Heat Stress, F. Yang, A. M. Parkhurst, C. N. Lee, T. M. Brown-Brandl, P. E. Hillman
Using Functional Data Analysis To Evaluate Effect Of Shade On Body Temperature Of Feedlot Heifers During Environmental Heat Stress, F. Yang, A. M. Parkhurst, C. N. Lee, T. M. Brown-Brandl, P. E. Hillman
Conference on Applied Statistics in Agriculture
Heat stress can be a serious problem for cattle. Body temperature (Tb) is a good measure of an animal’s thermo-regulatory response to an environmental thermal challenge. Previous studies found that Tb increases in response to increasing ambient temperature in a controlled chamber. However, when animals are in an uncontrolled environment, Tb is subject to many uncontrolled environmental factors, such as sunshade, wind, and humidity, that increase variation in the data. Hence, functional data analysis (FDA) was applied to analyze the data with uncontrolled environmental factors as curves in the whole series of days in this study. Breed (Angus, MARCIII, MARC-I, …
Detecting Factors Associated With Springwheat Yield Stability In South Dakota Environments, Jixiang Wu, Karl Glover, William Berzonsky
Detecting Factors Associated With Springwheat Yield Stability In South Dakota Environments, Jixiang Wu, Karl Glover, William Berzonsky
Conference on Applied Statistics in Agriculture
Conventional yield stability analyses are focused on yield stability itself by using single linear regression method and/or additive main effect and multiplicative interaction (AMMI) analysis. It is likely that yield stability for a genotype is associated with many factors such as fertilizer level, soil types, weather conditions, and/or yield components. Detection of factors highly associated with yield stability, therefore, will help breeders develop cultivars adapted to diverse environments or to specific environments. In this study, we conducted correlation analysis based on both environments and genotypes for a data set with 22 spring wheat genotypes, which were evaluated in 18 environments …
Estimation Of Dose Requirements For Extreme Levels Of Efficacy, Mark West, Guy Hallman
Estimation Of Dose Requirements For Extreme Levels Of Efficacy, Mark West, Guy Hallman
Conference on Applied Statistics in Agriculture
The objective of this paper is to explore the extent of how dose-response models may be used to estimate extreme levels of efficacy for controlling insect pests and possibly other uses. Probit-9 mortality (99.9968% mortality) is a standard for treatment effectiveness in tephritid fruit fly research, and has been adopted by the United States Department of Agriculture for fruit flies and other pests. Data taken from the phytosanitary treatment (PT) literature are analyzed. These data are used to fit dose-response models with logit, probit and complimentary log-log links. The effectiveness of these models for predicting extreme levels of efficacy is …
A Simulation Study Of The Small Sample Properties Of Likelihood Based Inference For The Beta Distribution, Kevin Thompson, Edward Gbur
A Simulation Study Of The Small Sample Properties Of Likelihood Based Inference For The Beta Distribution, Kevin Thompson, Edward Gbur
Conference on Applied Statistics in Agriculture
Researchers often collect proportion data that cannot be interpreted as arising from a set of Bernoulli trials. Analyses based on the beta distribution may be appropriate for such data. The SAS® GLIMMIX procedure provides a tool for these analyses using a likelihood based approach in the context of generalized linear mixed models. Since the t and F-distribution based inference employed in this approach relies on asymptotic properties, it is important to understand the sample sizes required to obtain reasonable approximate answers to inference questions. In addition, the complexity of the likelihood functions can lead to numerical issues for optimization algorithms …
Non-Normal Data In Agricultural Experiments, W. W. Stroup
Non-Normal Data In Agricultural Experiments, W. W. Stroup
Conference on Applied Statistics in Agriculture
Advances in computers and modeling over the past couple of decades have greatly expanded options for analyzing non-normal data. Prior to the 1990’s, options were largely limited to analysis of variance (ANOVA), either on untransformed data or after applying a variance stabilizing transformation. With or without transformations, this approach depends heavily on the Central Limit Theorem and ANOVA’s robustness. The availability of software such as R’s lme4 package and SAS® PROC GLIMMIX changed the conversation with regard to non-normal data. With expanded options come dilemmas. We have software choices – R and SAS among many others. Models have conditional and …
Multivariate Statistical Analysis Of Terrestrial Invertebrate Index Of Biotic Integrity, Bahman Shafii, William J. Price, Norm Merz, Timothy D. Hatten
Multivariate Statistical Analysis Of Terrestrial Invertebrate Index Of Biotic Integrity, Bahman Shafii, William J. Price, Norm Merz, Timothy D. Hatten
Conference on Applied Statistics in Agriculture
The Index of Biotic Integrity (IBI) is designed to measure the changes in ecological and environmental conditions as affected by human disturbances. In practice, the IBI is used in various ecological applications to detect divergence in biological integrity attributable to human actions. Last year during this conference, methodologies for developing an Avian Index of Biotic Integrity (A-IBI) were presented and discussed. The objective of this paper is to demonstrate the construction and statistical evaluation of a multi-metric terrestrial Invertebrate Index of Biotic Integrity (I-IBI) using the same multivariate statistical techniques. Canonical correlation analyses were utilized to select pertinent invertebrate metrics …
Characterizing Benthic Macroinvertebrate Community Responses To Nutrient Addition Using Nmds And Baci Analyses, Bahman Shafii, William J. Price, G. Wayne Minshall, Charlie Holderman, Paul J. Anders, Gary Lester, Pat Barrett
Characterizing Benthic Macroinvertebrate Community Responses To Nutrient Addition Using Nmds And Baci Analyses, Bahman Shafii, William J. Price, G. Wayne Minshall, Charlie Holderman, Paul J. Anders, Gary Lester, Pat Barrett
Conference on Applied Statistics in Agriculture
Nonmetric multidimensional scaling (NMDS) is an ordination technique which is often used for information visualization and exploring similarities or dissimilarities in ecological data. In principle, NMDS maximizes rank-order correlation between distance measures and distance in the ordination space. Ordination points are adjusted in a manner that minimizes stress, where stress is defined as a measure of the discordance between the two kinds of distances. Before and After Control Impact (BACI) is a classical analysis of variance method for measuring the potential influence of an environmental disturbance. Such effects can be assessed by comparing conditions before and after a planned activity. …
Thou Shall Not Brush Your Teeth While Eating Breakfast: A 7- Step Program For Researchers Previously Hurt In Data Analysis, Edzard Van Santen
Thou Shall Not Brush Your Teeth While Eating Breakfast: A 7- Step Program For Researchers Previously Hurt In Data Analysis, Edzard Van Santen
Conference on Applied Statistics in Agriculture
After years of providing statistical advice to fellow faculty members and graduate students, I have come to realize that it is not necessarily the big issues, but lack of knowledge of basic data analysis principles that get my clients into trouble. My claim is that if researchers and students internalized two basic definitions they would not have any problems analyzing most of their experiments. The definitions of Experimental Unit (EU) as the smallest physical unit to which a treatment may be applied and Experimental Error (Exp. Err.) as the variation among EUs treated alike are the basis for successful data …
Comparing Functional Data Analysis And Hysteresis Loops When Testing Treatments For Reducing Heat Stress In Dairy Cows, S. Maynes, A. M. Parkhurst, J. B. Gaughan, T. L. Mader
Comparing Functional Data Analysis And Hysteresis Loops When Testing Treatments For Reducing Heat Stress In Dairy Cows, S. Maynes, A. M. Parkhurst, J. B. Gaughan, T. L. Mader
Conference on Applied Statistics in Agriculture
Various techniques are commonly used to reduce heat stress, including sprayers and misters, shading, and changes in feed. Oftentimes studies are performed where researchers do not control the times when animals use shading or other means available to reduce heat stress, making it hard to test differences between treatments. Two methods are used on data from a study where Holstein cows were given free access to weight activated “cow showers.” Functional data analysis can be used to model body temperature as a function of time and environmental variables such as the Heat Load Index. Differences between treatment groups can be …
Five Things I Wish My Mother Had Told Me, About Statistics That Is, Philip M. Dixon
Five Things I Wish My Mother Had Told Me, About Statistics That Is, Philip M. Dixon
Conference on Applied Statistics in Agriculture
I present five short stories, each describing something I wish I had known and appreciated earlier in my statistical life. The five are Simpson's paradox is everywhere, numerical optimization algorithms can be deceived, you can't always trust the Satterthwaite approximation, BLUP's are wonderful things, and It's good to know Reverend Bayes.
On The Small Sample Behavior Of Generalized Linear Mixed Models With Complex Experiments, Julie Couton, Walt Stroup
On The Small Sample Behavior Of Generalized Linear Mixed Models With Complex Experiments, Julie Couton, Walt Stroup
Conference on Applied Statistics in Agriculture
Generalized linear mixed models (GLMMs), regardless of the software used to implement them (R, SAS, etc.), can be formulated as conditional or marginal models and can be computed using pseudo-likelihood, penalized quasi-likelihood, or integral approximation methods. While information exists about the small sample behavior of GLMMs for some cases- notably RCBDs with Binomial or count data- little is known about GLMMs for continuous proportions (e.g. Beta) or time-to-event (e.g. Gamma) data or for more complex designs such as the split-plot. In this presentation we review the major model formulation and estimation options and compare their small sample performance for cases …
Editor's Preface And Table Of Contents, Weixing Song
Editor's Preface And Table Of Contents, Weixing Song
Conference on Applied Statistics in Agriculture
These proceedings contain papers presented in the twenty-fifth annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 28 - April 30, 2013.