Michael Blasnik
> If there are no missing data, then a quick approach to get
> a 7 period moving
> sum is:
>
> bysort subject (day) : gen exer_cum=sum(exercise)
> by subject: gen exer_sum7=exer_cum-exercum[_n-6]
>
This is a very cute method. It should give
results equivalent to the time series methods
_unless_ there are gaps in the data, i.e. not
all dates are consecutive within panels.
(I think this is what Michael means by his
reference to missing data.)
Nick
[email protected]
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