Thanks Infinito ... if you really want to do it right ... short game proficiency could be defined by what percentage of the times you miss the GIR do you make par or better. Here's what I do ... (and yes it's very obvious --- I have no life).
If you add the holes you played which are right in your profile and I think are used for stats purposes .... (birdies, pars, bogeys) and multiply by your GIR percentage (again in your profile) .. you can get the total Grees you hit in Reg ... and of course by subtracting you can determine those you missed in reg. Divide your Ham & Eggs by the total greens missed and in my case I get 60.5% which means when I miss a Green in Reg .. I make par or better 60.5% of the time.
The way I look at my game there are 2 key measurements. 1) GIR and 2) short game. Below I've compared them to one of the best on WGT.
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GIR % - I only hit 65.7% GIR, AvatarLee hits 81.3%.
Short Game % - I achieve this 60.5% of the time .. AvatarLee does it 85.3%.
Obviously the higher the % of both .. the better your short game.