Janet Rosenbaum <[EMAIL PROTECTED]> writes: > I hope someone here knows the answer to this since it will save me from > delving deep into documentation. > > Based on 22 pairs of vectors, I have noticed that tetrachoric > correlation coefficients in stata are almost uniformly higher than those > in R, sometimes dramatically so (TCC=.61 in stata, .51 in R; .51 in > stata, .39 in R). Stata's estimate is higher than R's in 20 out of 22 > computations, although the estimates always fall within the 95% CI for > the TCC calculated by R. > > Do stata and R calculate TCC in dramatically different ways? Is the > handling of missing data perhaps different? Any thoughts? > > Btw, I am sending this question only to the R-help list.
A bit more information seems necessary: - tetrachoric correlations depend on 4 numbers, so you should be able to give a direct example - you're not telling us how you calculate the TCC in R. This is not obvious (package polycor?). -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
