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a5954345
2007 Dec 19
1
Correlation when one variable has zero variance (polychoric?)
...f the package) with those
tables when most cells are zero due to no variability on one variable):
> polychor(med$ADRI_LAN, rate$ADRI_LAN, ML=T)
Error in tab * log(P) : non-conformable arrays
I've seen some posts where sparse tables were trouble, eg:
http://www.nabble.com/polychor-error-td5954345.html#a5954345
"You're expecting a lot out of ML to get estimates of the first couple of
thresholds for rows and the first for columns. [which were mostly zeroes]"
Are the polychoric estimates using the approximation completely wrong? Is
there any way to compute a polychoric cor...