Dear Community,
I emphasize the use of graphical methods to examine residuals for a Panel
model and want to plot the Standard Deviation of residuals by group.
I used the following for plotting residuals by group:
>library(lattice)
>xyplot((residuals(fixed.reg1.1))~countrynr,data=data.plm)
But I have no idea how to adjust this for the SD of Residuals by group ?
Thanks for attention and help!
Katie
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