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 true, how can one estimate 95% confidence intervals for the
correlations? My guess would be
mat = hetcor(dataframe)
mat$correlation - (1.96 * mat$std.errors)
mat$correlation + (1.96 * mat$std.errors)
Thanks,
Andy
--
Andy Fugard, Postgraduate Research Student
Psychology (Room S6), The University of Edinburgh,
7 George Square, Edinburgh EH8 9JZ, UK
+44 (0)78 123 87190 http://figuraleffect.googlepages.com/
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
______________________________________________
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.
