which version of "beta" is included in Numbers Stock attributes

Are you referring to this?

If so, the beta, like other data in the STOCK function, is retrieved from Yahoo! Finance.

I suggest a web search using terms like: yahoo finance beta calculation. Your answer will be there somewhere.

Here is one hit from five years ago, which may or may not still hold true.

And some more technical discussion here.

As you probably know beta calculations vary depending on the market indexes and periods used. If you really want to get down in the weeds, you can check out discussions like this one.

SG

Glad you were able to solve your own problem.😀

SG