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A dataset from ?? (I don't remember).
data(pHdata)
A data frame with 160 rows and 4 columns. Column SIRE is a factor nested in column DAM.
SIRE
DAM
data(pHdata) str(pHdata) table(droplevels(pHdata[pHdata$DAM=="D1","SIRE"])) table(droplevels(pHdata[pHdata$DAM=="D2","SIRE"])) table(droplevels(pHdata[pHdata$DAM=="D3","SIRE"]))
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