R: SAS (if/then statement )in R

Question

I was working previously with SAS and then decided to shift to R for academic requirements reasons. My data (healthdemo) are health data containing some health diagnostic co

Answer 1

I suppose the problem is du to icd_num not being numeric.

Use the following command to create this variable:

healthdemo$icd_num <- as.numeric(substr(healthdemo$ICDCODE, 2,
                                        nchar(healthdemo$ICDCODE)))

(If you want to get rid of the numbers after the ., replace as.numeric with as.integer.)

Then your first approach should work:

healthdemo$cvd[healthdemo$icd_char == 'I' &
               01 <= healthdemo$icd_num &
               healthdemo$icd_num < 52 ] <- 1