[R] tetrachoric correlations

[Kjetil Halvorsen]

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Kjetil

On Fri, Apr 2, 2010 at 7:25 PM, HAKAN DEMIRTAS <demirtas at uic.edu> wrote:
> Hi,
>
> Is there any R library/package that calculates tetrachoric correlations from given marginals and Pearson correlations among ordinal variables?
>
> Inputs to polychor function in polycor package are either contingency tables or ordinal data themselves. I am looking for something that takes marginal distributions and Pearson correlation as inputs.
>
> For example, Y1=(1,2,3) with P(Y1=1)=0.3, P(Y1=2)=0.5, P(Y1=3)=0.2 and
> Y2=(1,2) with P(Y2=1)=0.6, P(Y2=2)=0.4, and corr(Y1,Y2)=0.5 (Pearson
> correlation among ordinal variables)
>
> How do I calculate the tetrachoric correlation here?
>
> Thanks,
> Hakan Demirtas
>        [[alternative HTML version deleted]]
>
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