I have a "data frame" like this:
Category Observed_value A 100 A 130 A 140 B 90 C 80 D 120 D 130
I need to create an index column that show the number of the observation
for each category. I have three observations in the category A, one in
category B, one in category C and two in category D. The new matrix should
be like this:
Category Observed_value Index A 100 1 A 130 2 A 140 3 B 90 1 C 80 1
D 120 1 D 130 2
Please, could anyone help me with this problem?
Thank you.
--
Marcos Martins Santos
mmsantos...@gmail.com
--
Skype: marcosmartinssantos
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