Wednesday, July 01, 2009

Projecting the NBA Draft

After posting the results from my similarity scores system, I discovered that my system is by no means the only one out there. I was already aware of Ed Weiland's work over at Hoops Analyst but not aware of the recent postings by Kevin Pelton at Basketball Prospectus or the work of Richard Lu at Draft Outcast.

All of these systems provide a different perspective - Weiland's system uses data from college players who didn't make it; Pelton's system compares projected rookie seasons and Lu's looks at how players will fit into the team whom they were drafted by. To add something new to the discussion, I decided to make career PER projections.

First off, I made some modifications to my similarity scores system. The categories are now weighted as follows:

5: Age
4: Height, Stls/PF, Blks/PF
3: Weight, Pure point rating, Rb/40, 3p/FGA
2: FTA/FGA, Pts/40

Honestly, adding weights didn't change the rankings very much, so even though the weights are more art than science, I'm comfortable that I'm not adding much bias to the results.

Having generated lists of comps for every draft pick, I then averaged the career NBA PER for their comp list, weighted by the strength of the comparison.

Without any further ado, here are the results:























































Player Mean PER Comps
Blake Griffin 18.79 9
DeJuan Blair 17.51 6
Jonny Flynn 17.09 13
James Harden 16.69 10
Nick Calathes 16.07 9
Tyreke Evans 15.45 28
Stephen Curry 15.28 13
Patrick Mills 15.28 16
Austin Daye 14.67 12
DeMar DeRozan 14.54 18
Jrue Holiday 14.17 5
Ty Lawson 14.14 10
Jeff Teague 13.76 21
Lester Hudson 13.70 1
Darren Collison 13.69 28
Tyler Hansbrough 13.52 18
James Johnson 13.38 78
Ahmad Nivins 12.95 49
Jordan Hill 12.93 112
Jon Brockman 12.87 50
B.J. Mullens 12.85 2
Danny Green 12.80 58
Derrick Brown 12.76 65
Chinemelu Elonu 12.69 38
Eric Maynor 12.61 57
DeMarre Carroll 12.61 80
Earl Clark 12.60 56
Chase Budinger 12.60 103
Terrence Williams 12.56 33
Gerald Henderson 12.54 85
Jeff Pendergraph 12.50 100
Hasheem Thabeet 12.45 2
Dante Cunningham 12.40 95
Marcus Thornton 12.33 89
Taj Gibson 12.33 28
Wayne Ellington 12.28 103
A.J. Price 12.23 59
Toney Douglas 12.01 77
Sam Young 11.98 36
Jodie Meeks 11.97 77
Robert Dozier 11.83 31
DaJuan Summers 11.67 49
Jack McClinton 11.66 5
Jermaine Taylor 11.61 49
Taylor Griffin 11.47 55
Robert Vaden 11.40 15
Goran Suton 11.23 27
Calvin Brock 11.07 33
Chester Frazier 10.41 15




Interestingly, these results line up pretty well with my own subjective feelings about the draft. Blake Griffin, James Harden and Tyreke Evans are viewed here as strong top 5 picks while DeJuan Blair and Nick Calathes stand out as sleepers. Interestingly, the system is not as high on Ty Lawson as I am, as undersized points don't have a great history, and prefers Jonny Flynn and even Patrick Mills. I'm not sure Flynn or Mills are quite as good as their comps, but they both fit the mold of quality NBA guards. Also don't read anything into the low ranking of Hasheem Thabeet - with only 2 comparable players and neither being strong comps at that, he is too unique of a player for this system to really apply to him.

What I like about this system is that most later draft picks are seen as 'generic' players, meaning they have tons of valid comps and not great projected PERs. For the higher picks, this is not so much the case, suggesting they have much more of a future as stars. For high picks like Jordan Hill and Gerald Henderson who have a ton of comps, this may be a sign that they are destined to be role players. I also included Illini alums Chester Frazier and Calvin Brock, two players who were not drafted and are not expected to make a summer league roster, to test the system. Interestingly, they are the two lowest-ranked players here, which gives me more faith in the system. Now we will just have to sit back and see if the 2009-10 season confirms our predictions!