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hi
i want to estimate effect of weekly in my data (frequency weekly). by this code "series d1= @day=@minsby(@day,@datefloor(@date, "m"))" it generate dummy for the first week of every month. how can modify the code to make dummy like this:
1-generate dummy for the first and second week for every month
2-generate dymmy just for the second week for every month.

How are you defining the first and second week of the month?

first Sat 08/02/1991 and the second Fri 15/02/1991

I don't understand that.

sorry,
i have not the first week for the first month for my data because it start by the second week 08/02/1991 for the Feb month, but the others month start by the first week.

That still doesn't make sense. What is the first week of a month? The first week in which any day of the week occurs within the month? The first week in which the Monday is in the month? The first week in which the Sunday is in the week? etc...

Friday , how can generate dummy for my two case

In your workfile's case it is easy:

but when i use this code
first case: first & second week take 1 for every month the 08/02/1991 should take 1 not "na" value
second case: second week take 1 for every month the 08/02/1991 should take 1 not "na" value

I'm sure you can figure out how to fix the first observations.

Got it!, Edit
thank you very much for your help :)