How do you determine value of a PSA graded set?

[Bicem]

no, no, and maybe.

[tbob]

Unfortunately complete sets usually sell for less than the sum of the individual cards, that's been my experience and that is why I usually sell prewar sets card by card. I know it doesn't make any sense because it doesn't take in to account all the sweat and toil and patience and work in putting a set together but that's just what I've found out.

[Bicem]

agreed, unless it's a really, really rare set that completing card by card could be next to impossible - then I could see a higher demand for the complete set vs the individual cards.

[Griffins]

enter the grades into vcp, that will give you a pretty good idea.
I've had really good luck selling sets intact, when you figure in the costs and time even if it goes for a bit less it's still worth it.

[tiger8mush]

sum of SMR * 84%

[Exhibitman]

Monkey + Dart + Board w/Numbers

The only reliable valuation tool is actual results from sales and auctions.

[Thrill-of-the-Hunt]

when buying a group you have to be educated to know if there is a low pop common or key card amongst them. the price will be above average for that.
i am not a believer in SMR for pricing, however, the psa pop report can be helpful in determining what cards could bring a premium.