Papers by George Milliken
Quality Engineering, 2008
Long-term experiments are commonly used tools in agronomy, soil science and other disciplines for... more Long-term experiments are commonly used tools in agronomy, soil science and other disciplines for comparing the effects of different treatment regimes over an extended length of time. Periodic measurements, typically annual, are taken on experimental units and are often analysed by using customary tools and models for repeated measures. These models contain nothing that accounts for the random environmental variations that typically affect all experimental units simultaneously and can alter treatment effects. This added variability can dominate that from all other sources and can adversely influence the results of a statistical analysis and interfere with its interpretation. The effect that this has on the standard repeated measures analysis is quantified by using an alternative model that allows for random variations over time. This model, however, is not useful for analysis because the random effects are confounded with fixed effects that are already in the repeated measures model. Possible solutions are reviewed and recommendations are made for improving statistical analysis and interpretation in the presence of these extra random variations.
Poultry Science, Dec 1, 1987
Hens of two moderately inbred White Leghorn stocks, known to differ significantly in escape and a... more Hens of two moderately inbred White Leghorn stocks, known to differ significantly in escape and avoidance behavior, were compared for productivity traits, nervousness, and feather loss when housed four or eight per cage at densities of 348 (high), 464 (medium), and 580 (low) cm2/bird. Differences were found between stocks in sexual maturity, egg production traits, body weights, nervousness, and feather loss. The more nervous strain lost more feathers. Highest density housing depressed performance and increased nervousness and feather loss, but differences were generally lacking between the medium and lowest density housing. Group size effects were not detected for productivity traits, but hens kept in groups of eight had increased nervousness and feather loss. No interactions were detected between stocks and density, stocks and group size, or density and group size.
Poultry Science, Aug 1, 1987
Two experiments compared performance traits, feather loss, and nervousness of hens kept in contra... more Two experiments compared performance traits, feather loss, and nervousness of hens kept in contrasting homogeneous and heterogeneous body weight groupings. In addition, 15-day periods of daily uterine palpating vs nonpalpating for an egg in the uterus were compared for effects on egg production. Eighteen-wk-old pullets were weighed and characterized as light, medium, or heavy and housed in laying cages at 19 wk for a 50-wk production period. In Experiment 1, two hens were placed in each cage and there were three treatment groups: both light (L), mixed or 1 heavy and 1 light (X), and both heavy (H). In Experiment 2, three pullets were used per cage; a medium-weight group (M) was included and mixed cages included 1 heavy, 1 medium, and 1 light weight bird. In an ancillary experiment, 50-wk-old hens were also palpated or not palpated for an egg in the uterus over a single 15-day period. Results indicated that differences that were present in initial body weight groups persisted over the 50-wk period in Experiments 1 and 2 with no effect of weight grouping on body weight gain, egg production, and livability. Differences that were associated with weight groups were: age at sexual maturity, egg weight, egg mass, and nervousness score. No differences in mean feather scores were present among weight groups. Comparisons between individual hens of the same relative weight but kept in homogeneous or heterogeneous weight groups failed to indicate competitive advantages or disadvantages in egg production, feathering, and nervousness scores. No significant associations were found between nervousness scores of individual hens and other traits except for total body weight gain in Experiment 1, in which individuals that gained more were less nervous in the X groups (r = -.55). Palpating hens daily for two 15-day periods significantly increased hen-day egg production in Experiment 2 and nonsignificantly in Experiment 1, with no influence of palpation on hen-day egg production, egg weight, or egg mass in the ancillary experiment.
Technometrics, May 1, 1990
to. Nonlinear Regression Analysis and Its Applications. contents is not available. Tags: Linear M... more to. Nonlinear Regression Analysis and Its Applications. contents is not available. Tags: Linear Models • Regression Analysis • Statistics • Log in to post comments Nonlinear Regression Analysis and Its Applications-Wiley Online. Statistical Tools for Nonlinear Regression, Second Edition, presents methods for. The examples are analyzed with the free software nls2 updated to deal with the new The nls2 package is implemented in S-Plus and R. Its main advantages are to The wealth of applications and code for using the specialized software Amazon.com: Nonlinear Regression Analysis and Its Applications 9780470139004: Douglas M. Bates, Donald G. Watts: Books. Nonlinear Regression Analysis and Its Applications-Book Depository
Technometrics, Nov 1, 1985
Analysis of Messy Data Volume 1
Biometrische Zeitschrift, 1974
Springer eBooks, 1998
Bacteria in Oligotrophic Environments; Richard Y. Morita forlhcomiRI Tilles in Ihe Chapman Ii HIl... more Bacteria in Oligotrophic Environments; Richard Y. Morita forlhcomiRI Tilles in Ihe Chapman Ii HIli li~robiololY Series Oxygen Regulation of Gene Regulation in Bacteria; Rob Gunsalus, ed. Metal Ions in Gene Regulation; Simon Silver and William Walden, eds.
Kansas Agricultural Experiment Station Research Reports, 2000
CRC Press eBooks, May 15, 1989
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Papers by George Milliken