Question about set ratings

helionaut

I've been involved with the registry for about 5 years now, so I'm pretty familiar with the way it works and little details and such. But here's something I can't figure out. If you look at the 1975 Baseball rankings, you'll see my set, No White Borders, is at #15 with a GPA and Set Rating of 8.02. Being 100% complete, GPA and Rating should be exactly equal. However, the #14 set, also 100%, is 8.01 GPA with an 8.03 rating. How can that be? I think I've heard that if cards are PSA/DNA'd, they get a little bonus, but I don't know that for sure. And anyway, none of his cards show as being auto'd. Could it just be a computer glitch? Or is there some other bonus? And no, this is not (completely) about me wanting to move up. I'm adding 9s so I'll move up eventually. I'm genuinely curious.

MeteoriteGuy

I think the answer may be in the card rating. You can see a crazy example of this in the 1983 Topps Football. In there I have 10 cards. 4 PSA 10's, 5 PSA 9's and 1 PSA 8. Yet, my rating overall is under 9. Why? Because the PSA 8 is Joe Montana and that card has a weight of 9...even one of PSA 10's being a HOF doesn't help it be over a 9.

Clear Skies,
Mark Bostick
www.meteoritearticles.com

MeteoriteGuy

Sorry, guess I should note my 1983 cards can be found under "Mark's Cards"

Text

Mark

MeteoriteGuy

Looking a little more both 9's are 1 point. His 9 is better, I imagine being of a 1/1 rather a 1/7, but I can't image that being anything. Very impressive sets in the top 10.

148 JIM ROOKER 9 32 7
261 ANDY HASSLER 9 31 1

Strange.

Mark

calaban7

Hi, I think that you have something that could be looked at by the CU GODS. I have found no other example where when a person has 100% completion that does not have a matching rating. Intially I compared your 9's to his , and found that he has 5 nines with one of them worth (1-1/2) where as you had 18 nines with 2 being worth ( 1-1/2).
I'd call Cosetta Robins or Gayle Keane to get clarification(SP?) .
I like your set.

diamondman

Computer screw up. nothing more nothing less. just moo

VMFA115

Got to be the computer. Until about 18 months ago what you described was possible. The 68 Topps BB comes to mine as an example where almost no one with 100% completion had the same grades. Now, with their new algorythm for determining GPA, and when comparing sets at 100% completion, both percentages MUST be the same.

helionaut

In response to Meteoriteguy, the populations of cards have no impact on Set Ratings. While long ago this was discussed it was never a tenable action to take because populations can change swiftly and broadly. And having a PSA 10 card isn't going to give you any kind of bonus over a 9, other than the obvious 11% higher value. You are correct in that a weight-9 8 will drag down heavily a group of weight-1 9s and 10s, but with a set that is 100% complete, the math used to calculate GPA and Set Ratings will come out to be exactly equal, given that no errors are made or bonuses given to one set and not the other. I haven't copied out the #14 set's individual grades to see where the error is, but it would be interesting to see if he's got an 8.01 set or an 8.03 set. So I think it's just one of those things.