I want insert two variables into a model.matrix, but I don't know how to do that
> k<-model.matrix(m2)
> dim(k)
[1] 475 28
k$township72<-rep(0,475)
Warning message:
In k$township72 <- rep(0, 475) : Coercing LHS to a list
Asked
Active
Viewed 28 times
0
Tommy Yu
- 928
- 3
- 9
- 25
-
Try replacing `$` with `[` ie. `k[,'township72'] – akrun May 31 '15 at 13:54
-
Still not working"> k[,'township72'] – Tommy Yu May 31 '15 at 13:58
-
Try the `cbind`, it should work. It worked with an example I created – akrun May 31 '15 at 13:58
-
1Yeah, it works. Thank you very much! – Tommy Yu May 31 '15 at 14:01