I’m not a health actuary, but I play one at work.
I inherited a spreadsheet that has numerous claims triangles for a number of LOBs.
Is there a correct number of months of history/development to use? Right now, we have 48 months of history and then it falls off the table. The spreadsheet was designed to hold 60 months’ worth, but there’s an input item where it’s specified to only use 48.
In order to save on space/computation, I’m probably going to pare down the ranges so that they only use 48 months.
I imagine the answer to my question above is “it depends”…on the credibility and timeliness and tail of your data, but I’d love to hear a discussion about it. Perhaps there are easy-to-obtain & easy-to-read resources you can point me to.