The way i see it, you can't extract a safe conclusion from the stats. As for putting for instance, if you want to know where you stand, you can take personal notes for the last year or two. Furthermore, as Bill says, some small perventage in birdies, eagles or pars come from shots out of green. Another element that has to be taken in account is the number of completed rounds. For instance, when i play a round and playing bad or wgt does it's own, i won't complete the round. In that case stats do not count.
It's a more academic discussion and less a safe guide for some conclusions in putting ability because if you do some elementary math calculations based on wgt's stats, you 'll see that numbers do not match at all!!
For example, if you see total putts and calculate taking in account eagles, birdies, pars, bogeys, double bogeys, others, you ''ll notice that there are several thousand ''invisibles'' putts...LOL