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  • cross-correlations in long format

    Hi guys, I am currently working on a dataset in long format and I need the average corss-correlation of all variables. I have tried to convert the dataset from long to wide using the reshape code but Stata returns 'values of variable t not unique within firmid'. I also tried it with a loop with the command xcorr, but I cannot find the correct way to do it. Can someone please help me?
    The dataset looks like this:

    firmid t return
    1 -20 0,02
    1 -19 -0,1
    1 -18 0,014
    1 -17 etc.
    2 -20
    2 -19
    2 -18
    2 -17
    etc...

    So I need the average cross-correlation at time -20, the average cross-correlation at time -19 etc stored as a new variable.

    Huub
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