Hi all,
I would like to replace the missing values of attributes with their respective group average instead of
their column average, eg. : averages
state region widgets north south east west
florida south 5 8.5 3 9 8
california west 10
new york north 15
delaware east 8
georgia south 1
texas south ?
nevada west 6
arizona west ?
maryland east 10
mass. east ?
maine north ?
vermont north 2