| Abstract: | Examined 6 statistics for estimating the population correlation ratio, ρ–2 (the proportionate reduction in error or variance explained index), for bias. Findings reveal that the expected value of an adjusted version of the sample correlation ratio, η?–2, was slightly less biased and less consistent than ω–2 or ε–2 with small population effects and sample sizes. A simplified method for generating approximate confidence intervals for ρ–2 was developed and found to be efficient relative to computation time. (25 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
