In paired comparison experiments, the worth or merit of a unit is measured through comparisons against other units. When paired comparison outcomes are collected over time and the merits of the units may be changing, it is often convenient to assume the data follow a non-linear state-space model. Typical paired comparison state-space models that assume a ® xed (unknown) autoregressive variance ...

To test for equality of variances given two independent random samples from univariate normal populations, popular choices would be the two-sample F test and Levene’s test. The latter is a nonparametric test while the former is parametric: it is the likelihood ratio test, and also a Wald test. Another Wald test of interest is based on the difference in the sample variances. We give a nonparamet...

M O S T of the developments in quantitative genetic theory focus on the study of intrapopulation concepts. With an increasing consideration of more divergent genetic materials, a need for theory relating to hybrid populations exists. In this study two methods for characterizing the gene effects and genetic variability in interpopulation hybrids are compared. Also, covariances among relatives ar...