Hello,

I have a a bunch of datasets with paneldata with variables for all companies from the S&P 500 companies ranging from the year 2002 - 2019. I need to put them into a paneldataset.

Right now it looks like this.

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It should look like this in the end. How can i put all the "size" variables into one column (compare mdr).
Array
If you could help me with this, this would be awesome.
Best Regards, Patrick