[R] substitute NA values

[Gabor Grothendieck]

I assume you are referring to na.roughfix in randomForest.  I don't think it
works for logical vectors or for factors outside of data frames:

> library(randomForest)
> DF <- data.frame(a = c(T, F, T, NA, T), b = c(1:3, NA, 5))
> na.roughfix(DF)
Error in na.roughfix.data.frame(DF) : na.roughfix only works for
numeric or factor
> DF$a <- factor(DF$a)
> na.roughfix(DF$a)
Error in na.roughfix.default(DF$a) : roughfix can only deal with numeric data.
> na.roughfix(DF)
      a   b
1  TRUE 1.0
2 FALSE 2.0
3  TRUE 3.0
4  TRUE 2.5
5  TRUE 5.0


On 3/30/07, Sergio Della Franca <sergio.della.franca at gmail.com> wrote:
> Dear R-Helpers,
>
>
> I have the following data set(y):
>
>  Test_Result   #_Test
>    t                 10
>    f                 14
>    f                 25
>    f                 NA
>    f                 40
>    t                45
>    t                44
>  <NA>           47
>    t                NA
>
>
> I want to replace the NA values with the following method:
> - for the numeric variable, replace NA with median
> - for character variable , replace NA with the most frequent level
>
> If i use x<-na.roughfix(y) the NA values are correctly replaced.
> But if i x<-na.roughfix(y$Test_Result) i obtain the following error:
>
> roughfix can only deal with numeric data.
>
> How can i solve this proble that i met every time i want to replace only the
> NA values of a column (type character)?
>
> Thank you in advance.
>
>
> Sergio Della Franca
>
>        [[alternative HTML version deleted]]
>
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