[R] analysis of covariance and constrained parameters

edge that these coefficients MUST BE 0 into my hypothesis testing. Knowing that these coefficients are 0 could influence the results of anova and AIC comparisons since it reduces the number of degrees of freedom associated with model. Many thanks for suggestions in advance! -- Steven Orzack Fres

[R] stepAIC and AIC question

ata = ghs_70_79, subset = ghs_70_full)) [1]2.000 3202.527 why are the AIC results from stepAIC different from those calculated directly? of course, AIC is only calculated up to an arbitrary constant. So, the issue is that some of the AIC values match and some don't. many thanks! -- Stev

[R] calculate correlation effect size using contrast analysis for an omnibus Chi-square test statistic

Rosenthal 1996 Psychological Methods 1: 331-340. many thanks! Steven Orzack Fresh Pond Research Institute 173 Harvey Street Cambridge, MA 02140 617 864-4307 www.freshpond.org [[alternative HTML version deleted]] __ R-help@r-project.org mailing

[R] negation in grep

o foo I have tried grep("oo!boo",txt) but it returns character(0). any suggestions are much appreciated! S. -- Steven Orzack __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.