Hi everyone,

I'm still taking my first steps in Stata. Still, I have quite a lot of data (simulated hourly data for three centuries).
As results differ depending on the input variables, I have about 30 different files (named Data_01.xlsx, Data_02.xlsx and so forth).
Each of the files is structured the same way: I always have the same variables (about 20) and about 788.000 observations (I included three runs in one Excel file).

Now I'd realized that I can't simply add data from a second file as it replaces data from the first file.
But of course, the aim is to analyze the whole data at a single blow.

Maybe someone here can help me along?

Thanks a lot and best wishes
Simon