st: generating one measure standard deviation for two time series variables

["Seth Binder" <seth.binder@yale.edu>]

Dear all,

I have daily time series data on minimum and maximum values for a given
variable, such that my dataset has three variables: date, maxvar, minvar.

I'm trying to calculate the overall standard deviation of my observations
for var. So far, I have tried to -reshape- my data from this wide form to a
long form such that the set of variables appears to be: date, min/max, var.
The idea is to then simply use -egen- sd(var), but I haven't been able to
reshape my data. 

Does anyone have any advice on how to properly -reshape- for my purposes, or
simply a quicker/better way to calculate the sd of var? 

Thanks,
Seth


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