how to sum up observations in the same month
Posted: Thu Feb 20, 2020 6:20 am
Hi,
I have a monthly time series, say y.
Now I want to sum up the obsevations in the same month?
How to do that?
Thanks!
I have a monthly time series, say y.
Now I want to sum up the obsevations in the same month?
How to do that?
Thanks!