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2001 Jun 07
2
once more: methods on missing data
Thanks for replies, but i was not precise enough.
The problem is not evaluating statistics on data with NA values.
The problem is evaluation of statistics on data with length = 0.
To make the problem more clear this is what i tried:
This works fine:
tapply(as.numeric(c(NA,2)), as.factor(c("a","b")), summary)
But i need SDev, aswell, so i copied summary.default to