[R] differing behavior of mean(), median() and sd() with na.rm

Ivan Calandra c@l@ndr@ @ending from rgzm@de
Wed Aug 22 16:33:53 CEST 2018

Dear useRs,

I have just noticed that when input is only NA with na.rm=TRUE, mean() 
results in NaN, whereas median() and sd() produce NA. Shouldn't it all 
be the same? I think NA makes more sense than NaN in that case.

x <- c(NA, NA, NA) mean(x, na.rm=TRUE) [1] NaN median(x, na.rm=TRUE) [1] 
NAsd(x, na.rm=TRUE) [1] NA

Thanks for any feedback.


Dr. Ivan Calandra
TraCEr, laboratory for Traceology and Controlled Experiments
MONREPOS Archaeological Research Centre and
Museum for Human Behavioural Evolution
Schloss Monrepos
56567 Neuwied, Germany
+49 (0) 2631 9772-243

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