limiting number of days observed for regression

[dangoebel]

I have a dataset that has 90 days work of history that I am doing a regression on. I'd like to also do regressions based on the last 25 days and the last 10 days of history. Does anyone know of a way to do this in SAS?

[dangoebel]

also worth mentioning is my data is set up with the most recent day as the last observation (90). So instead of regressing 1-90 I'd need to do 65-90 for a 25 day regression.

[stat_sas · Accepted solution]

Try obs data set option like this.

proc reg data=have(obs=10);

   model Y=X;

run;

quit;

proc reg data=have(obs=25);

   model Y=X;

run;

quit;

[dangoebel]

Perfect! Thanks