spd4testing()
spd4testing(missingY=TRUE,missingX=TRUE)
spd4testing(N=6,G=3,Y=4)
\dontrun{
spd4testing(N=6,G=4,Y=4) }
library(plm)
d <- spd4testing(missingY=FALSE,missingX=TRUE)
e<-plm(y ~ x + factor(year)*factor(gid), data=d, model="fd")
summary(e)
citation("spd4testing")
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