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Hi, I need to sample every 30th observation from a series starting from the last observation, this is if my last observation is on the 7/15/2020, then the 30th observation before that would be the 6/15/2020, and then 5/15/2020. I was trying to use dateadd but didnt work. I hope someone knows the answer.

Thanks

To be clear, you mean 7/15/2020, 6/15/2020 and 5/16/2020?

Oh, and what frequency is the workfile?

my data is daily and have observations since 1989.

It doesnt matter if a month have 31 or 28 or 29, just need to substract 30 observations so yes 5/16/2020.

Thanks

This assumes that you have daily 7 data that starts on Jan 1st 1989. If the starting date is different, you'll have to change the "28" value. Just do: and see what the value is on 2020/07/15 and use that value in the sample.

Thank you Gareth, it works perfectly.

Regards