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ad3inlan
2007 Dec 19
1
Correlation when one variable has zero variance (polychoric?)
...o
high). The underlying continuous scales should be normal, so I chose the
polychoric correlation. I'm using library(polychor) in its latest version
0.7.4
The problem is that sometimes the models predict always the same value
(i.e., the median). Example frequency table:
> table(med$ADRI_LAN, rate$ADRI_LAN)
2 3 4 5
3 28 179 141 50
That is, there is no variability in one of the variables (the only value
is 3, the median).
Pearson Product Moment Correlation consists of the covariation divided by
the square root of the product of the standard deviations of the two...