Displaying 1 result from an estimated 1 matches for "cpx_interp".
2008 Mar 20
1
Use of Factors
...The mean
function returns a value that is obviously wrong, though the count of
observations in the subsets is correct. I am including code snippets to
try to demostrate how this is all created:, sorry for the length of this
Here is output when I try to use the mean function,
mean_interp_HR=tapply(cpx_interp$HR[cpx_interp$visit==1 &
cpx_interp$xl==0],cpx_interp$SubjId[cpx_interp$visit==1 &
cpx_interp$xl==0],mean)
Warning in mean.default(X[[1L]], ...) :
argument is not numeric or logical: returning NA
Warning in mean.default(X[[2L]], ...) :
argument is not numeric or logical: returning NA
Wa...