Once upon a time, someone made a spreadsheet for pathfinder that was average statistics by CR. It was super useful, and I referenced it a lot.
But when I switched to Starfinder, I couldn't find a comparable one, so I decided to make one, which you can find here.
Text in red (CR 14 and up) are marked that way because there is only one "alien" at each CR, so the "average" is skewed.
Sources to date: core, alien archive, pact worlds, AP 1-6. Will update with AA2 information once I have it.
Any requests/criticisms/questions/etc. are welcome and appreciated.