The next step will allow us to replace the incorrect value indicators. If we give a look at the data again, we can see that in the right column the value -19 is displayed, which is obviously an incorrect value since for that variable, permissible values are between 0 and 100 (this is a percentage):
> SampleData$right [1] 80 NA 75 60 45 54 -19 13 NaN 98 5 NaN
We can replace that value with the missing value indicator that is said to be NA. To do this we will write:
SampleData$right[SampleData$right == -19 ] <- NA
Let's try to see this variable again:
> SampleData$right [1] 80 NA 75 60 45 54 NA 13 NaN 98 5 NaN
The incorrect value is no longer present, in its place there is a further NA value.
