Dear list,
I have a problem with the "corrgram" function. It does not seem to
"color" large negative correlations, while the same correlation, if
positive, provides no problems. Is this a bug?
require(corrgram)
a = seq(1,100)
b = -jitter(seq(1,100), 80)
cor(a,b) # r about -.96
c=as.data.frame(cbind(a,b))
corrgram(c, order=NULL, lower.panel=panel.pie,upper.panel=NULL,
text.panel=panel.txt) # no color
c$b = -1*c$b # flip direction of correlation
cor(c$a, c$b) # r now about +.96
corrgram(c, order=NULL, lower.panel=panel.pie,upper.panel=NULL,
text.panel=panel.txt) #no problem with color.
Thanks!
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