Factset Beta formula help

Hi, I’d really appreciate if someone could help me understand what this Factset beta formula is doing: “=FDS(ticker, “BETA (”“SP50"”, “date”, “date”-59M, M)”)" My understanding is that the formula is looking up the ticker beta, benchmarked against the SP500, at the date specified, going back 59 months on a rolling basis. I don’t quite understand what this going back 59months business is all about. Thanks a lot for the help!

y dun u just call ur factset consultant?

it is 60 month since factset starts at zero. so it is a 5yr montly beta of retruns against what ever bench (in this case S&P500)