SAS reading a file in long format

问题

I have a file in long format, like so:

name weight month cal

bob 80 01 5000

ben 70 01 4989

mary 60 01 3000

bob 81 02 4999

ben 68 02 6000

mary 57 02 2800

...

I would like to create N linear regressions of weight over cal: one for each of the months. I know how to read the data into a dataset and how to fit a regression model.

I am not sure how I do this in a loop for the N months...

Any pointers?

Many thanks!

来源：https://stackoverflow.com/questions/22589223/sas-reading-a-file-in-long-format