[R] inconsistent behavior of mean, median, var

From: Richard M. Heiberger <rmh_at_temple.edu>
Date: Mon 22 Jan 2007 - 02:52:30 GMT

> mean(c("-1","0", "1"))

[1] NA
Warning message:
argument is not numeric or logical: returning NA in: mean.default(c("-1", "0", "1"))
> median(c("-1","0", "1"))

Error in median.default(c("-1", "0", "1")) :

        need numeric data
> var(c("-1","0", "1"))

[1] 1

Is the above intentional behavior? mean and median of character data give a warning and error. var gives the result of coercing the argument to numeric.

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