Dear John,
Yes, that's great - thanks!
Andy
John Fox wrote:
Dear Andy,
Yes, the tetrachoric correlation is a special case of the polychoric
correlation when both factors are dichotomous.
The 95-percent confidence interval that you suggest might be adequate if the
sample size is
Dear Andy,
Yes, the tetrachoric correlation is a special case of the polychoric
correlation when both factors are dichotomous.
The 95-percent confidence interval that you suggest might be adequate if the
sample size is sufficiently large and the correlation isn't too close to 0
or 1, but it is
Hi there,
Am I correct to believe that tetrachoric correlation is a special case
of polychoric correlation when there are only two levels to the ordered
factor? Thus it should be okay to use hetcor from the polycor package
to build a matrix of correlations for binary variables?
If this is
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