[R] If help

[David Winsemius]

On Jul 20, 2010, at 1:14 PM, Heiman, Thomas J. wrote:

> Hi Y'all,
>
> I have some data in a table with 2 columns. There are two values:  
> "Reduction" and "No Reduction. "  I am trying to make a new variable  
> change which recode the combinations from column 1 and 2 into a  
> single number.  Here is a snippet from the table:
>
> [1,] "NoReduction"              "NoReduction"
> [2,] "Reduction"                "Reduction"
> [3,] "NoReduction"              "NoReduction"
> [4,] "NoReduction"              "NoReduction"
> [5,] "Reduction"                "Reduction"
> [6,] "Reduction"                "Reduction"
> [7,] "Reduction"                "Reduction"
> [8,] "NoReduction"              "NoReduction"
> [9,] "NoReduction"              "NoReduction"
> [10,] "NoReduction"              "NoReduction"
>
> This is the code that I have written so far..
>
> for (i in 1:nrow(change20082009))
> if(change20082009[i,1]=='No Reduction' & change20082009[i,2]=='No  
> Reduction') "){change20082009[i,3] <- 1} else
> if(change20082009[i,1]=='No Reduction' & change20082009[i, 
> 2]=='Reduction'){change20082009[i,3] <- -1} else
> if(change20082009[i,1]=='Reduction'    & change20082009[i,2]=='No  
> Reduction') {change20082009[i,3] <- 2} else
> if(change20082009[i,1]=='Reduction'    & change20082009[i, 
> 2]=='Reduction') {change20082009[i,3] <- 0}
> )
>
> I can't seem to get the code above to work..Any suggestions (I am  
> sure it is really basic)? Is there a better way to do this?

You are going to have a problem if you think that "NoReduction" == 'No  
Reduction'

-- 
David