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Articles 601 - 609 of 609
Full-Text Articles in Physical Sciences and Mathematics
Comparison Of Hop Downy Mildew Epidemics Using Spatial Analysis, J. Richard Alldredge, Dennis A. Johnson, Rochelle Allwine
Comparison Of Hop Downy Mildew Epidemics Using Spatial Analysis, J. Richard Alldredge, Dennis A. Johnson, Rochelle Allwine
Conference on Applied Statistics in Agriculture
Methods of spatial analysis including distribution fitting, variance-to-mean ratios, Morisita's index, doublet and runs analyses, Greig-Smith analysis and variography were used to investigate the spatial pattern of hop downy mildew. Use of these methods allowed examination of the spatial structure of hop downy mildew at three spatial scales: within hop hills, between nearby hop hills, and for hop hills more separated in space. The results obtained were in general agreement for methods of analysis which assessed spatial structure at the same spatial scale with the exception of Morisita's index of clumping which did not identify clumps of diseased hills of …
The Use Of Near Infrared Reflectance For Evaluating Cotton Fineness And Maturity, Vicki A. Lancaster, Steven M. Buco, Joseph G. Montalvo Jr.
The Use Of Near Infrared Reflectance For Evaluating Cotton Fineness And Maturity, Vicki A. Lancaster, Steven M. Buco, Joseph G. Montalvo Jr.
Conference on Applied Statistics in Agriculture
The U.S. Department of Agriculture has proposed to develop Ii new high speed, high volume technique to assess cotton quality. This goal has led us to investigate the feasibility of near infrared reflectance spectroscopy as a technique for evaluating cotton fiber perimeter size and wall thickness, two of the physical characteristics used in the evaluation of cotton fineness and maturity.
In order to isolate the effects of perimeter size and wall thickness, nineteen cotton samples were selected on the basis of their having a nonsignificant correlation between these 2 measurements. The reflectance spectra from 1100 to 2500 nanometers was recorded …
Statistical Design And Analysis Of Dairy Nutrition Experiments To Improve Detection Of Milk Response Differences, Stephen R. Lowry
Statistical Design And Analysis Of Dairy Nutrition Experiments To Improve Detection Of Milk Response Differences, Stephen R. Lowry
Conference on Applied Statistics in Agriculture
The objective of many dairy nutrition experiments is to determine the effect of certain dietary treatments on milk production and quality responses. However, milk responses are quite variable and cows (experimental units) are expensive and have substantial maintenance costs. This manuscript reviews principles for planning to obtain good data relevant to the hypothesis, experimental design to control inherent variation, and interpreted analyses to facilitate understanding of dairy relationships. Emphasis is placed on assurance that milk response differences due to dietary treatments will have a high probability of being detected as significant. Guidelines addressing these principles along with suggested computer programs …
Statistical Models For Analysis Of Dose-Response Data, Karan P. Singh
Statistical Models For Analysis Of Dose-Response Data, Karan P. Singh
Conference on Applied Statistics in Agriculture
In this paper we propose three families of functional models for analysis of dose-response data. The first family is for modeling data which have a steep sloping line for an ascending portion of the response curve and a plateau representing maximum response or a sloping line representing little response at higher application levels. The second family is for modeling data which represent a steep sloping line on the ascending portion of the response curve and a declining curvature for declining response at higher application levels. The third family is for fitting data which show an initial plateau followed by increased …
Analysis Of A Two Lactation Target Animal Safety Study Of Somidobove Sustained Release Injection In Multiparous Dairy Cows, L. V. Tonkinson, R. P. Basson, R. K. Mcguffey, A. Deldar, L. Fisher
Analysis Of A Two Lactation Target Animal Safety Study Of Somidobove Sustained Release Injection In Multiparous Dairy Cows, L. V. Tonkinson, R. P. Basson, R. K. Mcguffey, A. Deldar, L. Fisher
Conference on Applied Statistics in Agriculture
An overview is given of the primary basis for the scientific inference that somidobove sustained release injection is safe for multiparous dairy cows. The process of analysis and interpretation of the voluminous data collected from a target animal safety study which started with 28 cows and lasted two lactations is described. This was a repeated measures study with most of 60 variables being measured or summarized every 28 days resulting in approximately 1500 measurements per cow. The statistical analysis was designed to screen the variables for biological change caused by treatment and consisted of a univariate analysis of variance for …
Statistical Issues In Studies Of Thermoregulation In Farm Animals, A. M. Parkhurst, G. L. Hahn
Statistical Issues In Studies Of Thermoregulation In Farm Animals, A. M. Parkhurst, G. L. Hahn
Conference on Applied Statistics in Agriculture
Patterns of tympanic temperature response were identified in ad-lib-fed cattle exposed to constant or cyclic (±7 C) conditions at two levels of air temperature: 10 C and 28 C. Use of time series analysis following the DDS approach of Pandit and Wu indicate the thermoregulatory control dynamics for steers at 28±7 C were markedly different from those at the other conditions. Preliminary evaluations using the ideas of chaos and non-linear dynamics show promise of further characterization of stress responses in farm animals.
Nonlinear Modeling Of Ph Decline In Beef Carcasses, James R. Schwenke, Curtis L. Kastner
Nonlinear Modeling Of Ph Decline In Beef Carcasses, James R. Schwenke, Curtis L. Kastner
Conference on Applied Statistics in Agriculture
Electrical stimulation speeds the rate of pH decline in beef muscle. A study was conducted to evaluate an electrical stimulation (ES) method for beef sides and its effect on pH decline compared to non-stimulated control counterparts using nonlinear modeling. The pH of each carcass in the study was measured at selected times over a 24-hour time period postmortem. A statistical methodology is described for comparing two treatments based on the mean pH decline over time. The repeated measures structure of the data is incorporated into the statistical procedure. A nonlinear exponential decay model is used to characterize the mean pH …
Recent Developments In Variance Component Estimation, R. R. Hocking
Recent Developments In Variance Component Estimation, R. R. Hocking
Conference on Applied Statistics in Agriculture
The purpose of this paper is to introduce some recent developments in variance component estimation with emphasis on techniques which provide diagnostic information on the data and the model assumptions. This paper concentrates on the balanced data situation, but suggests a natural extension to the case of unbalanced data. The basic ideas are illustrated by several numerical examples.
Editor's Preface, Table Of Contents, And List Of Attendees, George A. Milliken, James R. Schwenke
Editor's Preface, Table Of Contents, And List Of Attendees, George A. Milliken, James R. Schwenke
Conference on Applied Statistics in Agriculture
These proceedings contain papers presented at the first annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 30 through May 2, 1989.