A Note on Variance Heterogeneity in the Analysis of Variance

This article reviews and summarizes the empirical sampling studies of the effects of variance heterogeneity in the analysis of variance. The general conclusion of these studies, that heterogeneity of variance is not an occurrence of importance, is only demonstrated for the simple randomized design; it remains to be demonstrated for the more complex designs. There is also a general inattention to E( MS) and to the effects of the sampling model upon E( MS) and F. </jats:p

Population Ex(im)plosion?

The relationship between population density and per capita income was investigated for 117 nations with a population of more than one million persons. H1, the population explosion hypothesis, asserts that there is a negative relationship. H2, the population implosion hypothesis, asserts that there is a positive relationship. The data favor H2 rather than H1. </jats:p