[dmvaldman]

it's a lot of work, but something you could do is track how you feel (manually or some other way) and do a similar statistical analysis. chess elo was just convenient and aligned for me.

[runjake]

Yeah, I didn't mean to discount your article. Pretty clearly, it's working out for you.

I do have an iOS shortcut that tracks my mood with janky emojis. I use it at least once daily.