On 2/27/2016 1:34 PM, Michael Friendly wrote:
You might also find that an HE plot (library (heplots))
is illuminating.
Follow-up: Try the following with your example
library(heplots)
hs.mod <- lm(cbind(y1, y2) ~ x1 + x2, data=hs.r)
heplot(hs.mod, fill=TRUE)
uv.mod <- lm(cbind(u1, u2) ~ v1 + v2, data = uv)
heplot(uv.mod, fill=TRUE, asp=1)
In the first plot, x1, x2 are highly correlated, but neither is
individually significant in predicting y1, y2 by Roy's test.
The second plot is the transformation to canonical space,
where (u1, u2), (v1, v2) are uncorrelated and v1 is a highly
significant predictor of u1.
-Michael
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