Roger Dungan wrote:
[snip]> There are obvious work-rounds, like
sd(x, is.na(x)==F)
which gives the result (with error message) [1] 1.707825 Warning message: the condition has length > 1 and only the first element will be used in: if (na.rm) "complete.obs" else "all.obs"
What you are doing here looks very odd to me -- you are passing a vector of logicals as the value for the argument na.rm. This is odd because na.rm should be just a single logical value, not a vector of the same length as x (hence the warning message). Only the first element of that vector is used, so you are passing essentially a random value. By luck, in your example, the first element was T, which is why you got a value of 1.707825 as the result, and not NA. The rest might fall into place when this understanding is cleared up. -- Tony Plate