In the variable productivity In the variable productivity, there are three values of 9999. This is a recoded value that indicates don't know, and it
In the variable \"productivity\
In the variable "productivity", there are three values of 9999. This is a recoded value that indicates "don't know", and it does not mean the productivity index is 9999. We will have to recode these values to NA, which means not applicable or missing value, or they will skew the data. (Hint: Use the "replace" command. You must perform this step in R, and should not change the raw data from Excel.)
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