Thank you very much! One other question:
1) How can I replace a missing value for a different variable using the mean of a group?
I have missing values for a variable "area" and I want to replace the missing values with the mean of "area" by "neighborhood", where values are not missing.
Use PROC STDIZE as in the replace with zero case and use the MISSING=MEAN instead and the BY Statement to specify your By-Group
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