Re: [R] Tetrachoric correlation in R vs. stata

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Sat 24 Jun 2006 - 05:22:32 EST

Janet Rosenbaum <jrosenba@rand.org> 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:

-- 
   O__  ---- Peter Dalgaard             ุster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)                  FAX: (+45) 35327907

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Received on Sat Jun 24 06:48:26 2006

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