[R] conditional coding question

[Rui Barradas]

Hello,

Try the following.


incorp <- rep(NA, 4408)
incorp[groupinc == 5] <- 'cons'
incorp[(groupinc == -3:-2) & (indinc < 9)] <- 'ethnat'
incorp[(groupinc == 1:4) & (indinc > 8)] <- 'libmul'
incorp[(groupinc == -2:-1) & (indinc > 8)] <- 'civic'


Hope this helps,

Rui Barradas
Em 07-11-2012 23:07, haps escreveu:
> I have a big dataset. I want to create a new factor variable with certain
> conditions based on two existing numeric variables.
> Existing variables: indinc (range: 0 to 16), groupinc (range -3 to 5)
> Conditional values that 'incorp' will take:
> If groupinc = 5, then ‘cons’;
> If groupinc is -3 : -2, AND indinc <  9, then  ‘ethnat’;
> If groupinc is -2 : -1, AND indinc > 8, then ‘civic’;
> If groupinc is 1 : 4, AND indinc > 8, then ‘libmul’;
> The rest of the values should be coded as NA.
> #here is my code after attaching the data (4408 is the number of
> observations):#
> incorp <-
>    for (i in 1:4408) {
>      if (groupinc[i] == 5) {
>        incorp[i] = 'cons'
>      } else if ((groupinc[i] == -3:-2) & (indinc[i] < 9)) {
>        incorp[i] = 'ethnat'
>      } else if ((groupinc[i] == 1:4) & (indinc[i] > 8)) {
>        incorp[i] = 'libmul'
>      } else if ((groupinc[i] == -2:-1) & (indinc[i] > 8)) {
>        incorp[i] = 'civic'
>      } else = NA
>    }
> #error message#
> Error: unexpected '=' in:
> "      incorp[i] = 'civic'
>      } else ="
>
>
>
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