Displaying 1 result from an estimated 1 matches for "tallstubbyta".
2003 Jan 02
1
aggregate: "sum" not meaningful for factors
...ategory using aggregate, but for some
reason I get the error message "sum" not meaningful for factors even though
my vector is numeric. The data set is shown below.
Could someone please give a hint.
Thanks in advance!
Sincerely,
Tord
> names(test)
[1] "ObjektID" "tallstubbyta"
> is.factor(test$ObjektID); is.factor(test$tallstubbyta)
[1] TRUE
[1] FALSE
> is.numeric(test$ObjektID); is.numeric(test$tallstubbyta)
[1] FALSE
[1] TRUE
> mean(test$tallstubbyta)
[1] 0.01142584
> aggregate(test, list(test$ObjektID), length)[, c("Group.1", "tall...