Regards,
I need to create a variable that is the standard deviation of another
variable from a certain range of data. However, I need this standard
deviation to be created for all the observations. That is, I have the
following data, I want to calculate std_dev as the standard deviation
of the abnormal_return if dif<-4, but I want that standard dev to be
pasted for all rnages of difs...like this (where the 1.58 is the
standard deviation for abnormal_return data for the first 5
observations):
obs# dif abnormal_return std_dev
1 -9 2.3 1.58
2 -8 2.2 1.58
3 -7 3.3 1.58
4 -6 5.3 1.58
5 -5 1.1 1.58
6 -4 2.3 1.58
7 -3 2.3 1.58
8 -3 2.3 1.58
9 -1 2.3 1.58
Thanks!
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