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mdgvemwfxsuzs
2015 Apr 29
0
model.matrix and na.action
...any(is.na(X2[,"x"]))))
}
options("na.action") ## na.omit
d <- data.frame(x=c(NA,NA,1:5))
mm(d) ## TRUE FALSE
mm(d,set.opts=TRUE) ## TRUE TRUE
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