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MattPeter - that's a good point; I'll make a notation on my list to that point.
Alan - that's interesting - the results are fairly similar. I'd want SGC included also because it's possible certain issues are more frequently seen by PSA vs SGC and vice versa.
One question about your method - when an issue had variations/multiple poses, did you count it as one card or two? For example, the E102 Shmidt/Smith probably was an error that got fixed and the total for both variations should count as one card as that was the whole run; on the other hand, the 2 E92 Dockman Doyle poses probably were issued simultaneously (as each one has a population above the average card in the set) and should be counted as separate cards for the purpose of an average.