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Forward Cold-Start Validation

This study tests the first-year branch of the forward exposure-gated RAPM model. It compares every 2025-26 rookie's frozen preseason prior to the coefficient from the completed 2025-26 forward RAPM refit.

The outcome is not an independent ground-truth player value. It is the model's post-season, regular-only estimate and remains noisy for low-exposure players. That is why the report presents possession-weighted metrics and the realized exposure split alongside the raw correlation.

Definition

For rookie \(i\), the frozen preseason prediction is \(\widehat R_i^{pre}\) and the post-season forward-RAPM refit is \(\widehat R_i^{post}\). The table reports the error \(\widehat R_i^{post} - \widehat R_i^{pre}\). Possession-weighted statistics use each player's on-court possessions as \(w_i\).

2025-26 Metrics

Cohort Players On-court possessions Pearson Weighted Pearson Spearman Weighted Spearman MAE Weighted MAE RMSE Weighted RMSE
All first-year players 100 128,980 0.567 0.570 0.458 0.391 0.967 1.416 1.268 1.673
Drafted 1-60 55 109,463 0.523 0.579 0.400 0.447 1.165 1.469 1.482 1.730
Undrafted 45 19,517 0.161 0.241 0.085 0.076 0.725 1.116 0.943 1.303
Realized low exposure (<5%) 37 4,731 0.491 0.279 0.378 0.313 0.440 0.524 0.588 0.704
Realized rotation exposure (>=5%) 63 124,249 0.528 0.562 0.426 0.443 1.277 1.450 1.533 1.699

Prior Versus Refit

Each point is a first-year player. Point area scales with on-court possessions; orange points finished below 5% of team possession opportunities.

Frozen prior versus refitted forward RAPM

Rookie Detail

The table is sortable by every column. Prior rank orders the pre-season forecast; Refit rank orders the completed regular-season coefficient.

Prior rank Prior Refit rank Refit RAPM Adjustment Player Team Pos. Draft status Pick Possessions Exposure Low exposure
1 -0.36 3 +1.25 +1.62 Dylan Harper SAS G Drafted 1-60 2 3,207 39.0% No
2 -0.42 7 +0.27 +0.68 Cooper Flagg DAL F Drafted 1-60 1 4,943 58.7% No
3 -0.43 5 +0.88 +1.31 VJ Edgecombe PHI G Drafted 1-60 3 5,402 65.5% No
4 -0.54 1 +2.32 +2.86 Kon Knueppel CHA G-F Drafted 1-60 4 5,207 65.3% No
5 -0.69 11 -0.70 -0.01 Tre Johnson WAS G Drafted 1-60 6 3,076 36.8% No
6 -0.77 67 -3.33 -2.56 Ace Bailey UTA F Drafted 1-60 5 4,235 50.0% No
7 -0.85 2 +1.65 +2.50 Cedric Coward MEM G Drafted 1-60 11 3,386 40.8% No
8 -0.85 8 -0.19 +0.66 Collin Murray-Boyles TOR F Drafted 1-60 9 2,519 31.1% No
9 -0.89 9 -0.30 +0.59 Egor Dëmin BKN G Drafted 1-60 8 2,649 33.2% No
10 -0.90 41 -2.63 -1.73 Jeremiah Fears NOP G Drafted 1-60 7 4,446 53.6% No
11 -1.19 63 -3.22 -2.03 Derik Queen NOP C Drafted 1-60 13 4,280 51.6% No
12 -1.22 40 -2.61 -1.39 Walter Clayton Jr. UTA G Drafted 1-60 18 2,971 35.4% No
13 -1.25 17 -1.39 -0.14 Khaman Maluach PHX C Drafted 1-60 10 804 10.0% No
14 -1.34 23 -1.78 -0.43 Noa Essengue CHI F Drafted 1-60 12 14 0.2% Yes
15 -1.35 71 -3.37 -2.02 Carter Bryant SAS F Drafted 1-60 14 1,682 20.5% No
16 -1.50 58 -3.07 -1.56 Yang Hansen POR C Drafted 1-60 16 626 7.5% No
17 -1.51 6 +0.43 +1.94 Nique Clifford SAC G Drafted 1-60 24 3,873 47.4% No
18 -1.67 46 -2.79 -1.13 Nolan Traore BKN G Drafted 1-60 19 2,490 31.2% No
19 -1.77 16 -1.26 +0.51 Kasparas Jakučionis MIA G Drafted 1-60 20 2,054 24.2% No
20 -1.79 19 -1.55 +0.24 Joan Beringer MIN F Drafted 1-60 17 671 8.1% No
21 -1.91 100 -5.79 -3.88 Drake Powell BKN G-F Drafted 1-60 22 2,655 33.3% No
22 -1.94 93 -4.45 -2.51 Will Riley WAS F Drafted 1-60 21 3,434 41.1% No
23 -2.02 32 -2.13 -0.12 Jase Richardson ORL G Drafted 1-60 25 1,198 14.5% No
24 -2.04 38 -2.52 -0.48 Chaz Lanier DET G Drafted 1-60 37 537 6.6% No
25 -2.06 44 -2.65 -0.59 Alijah Martin TOR G Drafted 1-60 39 283 3.5% Yes
26 -2.09 43 -2.65 -0.55 Asa Newell ATL F Drafted 1-60 23 1,067 12.8% No
27 -2.10 10 -0.62 +1.48 Sion James CHA G Drafted 1-60 33 3,705 46.5% No
28 -2.11 79 -3.62 -1.51 Kam Jones IND G Drafted 1-60 38 1,308 15.7% No
29 -2.11 36 -2.41 -0.30 Danny Wolf BKN F Drafted 1-60 27 2,363 29.7% No
30 -2.12 33 -2.15 -0.03 John Tonje BOS G Drafted 1-60 53 88 1.1% Yes
31 -2.15 15 -1.15 +1.00 Yanic Konan Niederhäuser LAC C Drafted 1-60 30 848 10.7% No
32 -2.19 87 -4.09 -1.90 Ben Saraf BKN G Drafted 1-60 26 1,874 23.5% No
33 -2.26 55 -2.97 -0.71 Ryan Kalkbrenner CHA C Drafted 1-60 34 3,028 38.0% No
34 -2.27 18 -1.49 +0.79 Micah Peavy NOP G-F Drafted 1-60 40 1,910 23.0% No
35 -2.28 98 -5.27 -3.00 Brooks Barnhizer OKC G Drafted 1-60 44 703 8.5% No
36 -2.31 50 -2.87 -0.56 Johni Broome PHI F Drafted 1-60 35 111 1.3% Yes
37 -2.31 14 -1.12 +1.19 Jamir Watkins WAS F Drafted 1-60 43 2,170 26.0% No
38 -2.32 4 +1.05 +3.37 Hugo González BOS G Drafted 1-60 28 2,133 27.4% No
39 -2.35 81 -3.68 -1.33 Taelon Peter IND G Drafted 1-60 54 1,050 12.6% No
40 -2.35 39 -2.59 -0.23 Max Shulga BOS G Drafted 1-60 57 75 1.0% Yes
41 -2.40 27 -1.98 +0.42 Liam McNeeley CHA F Drafted 1-60 29 729 9.1% No
42 -2.40 37 -2.50 -0.10 Koby Brea PHX G Drafted 1-60 41 160 2.0% Yes
43 -2.42 12 -0.71 +1.71 Rasheer Fleming PHX F Drafted 1-60 31 1,316 16.4% No
44 -2.42 52 -2.88 -0.47 Noah Penda ORL G-F Drafted 1-60 32 1,550 18.8% No
45 -2.43 28 -2.00 +0.43 Javon Small MEM G Drafted 1-60 48 1,758 21.2% No
46 -2.45 53 -2.90 -0.44 Adou Thiero LAL G Drafted 1-60 36 301 3.7% Yes
47 -2.51 26 -1.97 +0.55 Kobe Sanders LAC G Drafted 1-60 50 2,741 34.5% No
48 -2.54 89 -4.33 -1.79 Amari Williams BOS F-C Drafted 1-60 46 297 3.8% Yes
49 -2.55 75 -3.49 -0.94 Will Richard GSW G Drafted 1-60 56 2,861 35.0% No
50 -2.60 85 -4.00 -1.40 Jahmai Mashack MEM G Drafted 1-60 59 1,427 17.2% No
51 -2.70 94 -4.78 -2.08 Maxime Raynaud SAC C Drafted 1-60 42 4,072 49.9% No
52 -2.75 49 -2.86 -0.11 Tyrese Proctor CLE G Drafted 1-60 49 1,115 13.5% No
53 -2.93 25 -1.89 +1.04 Lachlan Olbrich CHI C Drafted 1-60 55 732 8.7% No
54 -3.04 13 -1.10 +1.94 Ryan Nembhard DAL G Undrafted 2,426 28.8% No
55 -3.06 73 -3.39 -0.33 Chucky Hepburn TOR G Undrafted 26 0.3% Yes
56 -3.07 42 -2.64 +0.43 Mark Sears MIL G Undrafted 52 0.7% Yes
57 -3.07 30 -2.06 +1.02 LJ Cryer GSW G Undrafted 582 7.1% No
58 -3.09 80 -3.64 -0.55 Sean Pedulla LAC G Undrafted 60 0.8% Yes
59 -3.10 29 -2.01 +1.08 Mohamed Diawara NYK F Drafted 1-60 51 1,259 15.8% No
60 -3.12 65 -3.23 -0.11 Darius Brown II CLE G Undrafted 4 0.1% Yes
61 -3.14 74 -3.41 -0.27 Caleb Love POR G Undrafted 2,118 25.5% No
62 -3.15 34 -2.26 +0.89 Curtis Jones DEN G Undrafted 180 2.2% Yes
63 -3.17 31 -2.10 +1.07 David Jones Garcia SAS G Undrafted 150 1.8% Yes
64 -3.17 57 -3.04 +0.13 Chris Mañon LAL G Undrafted 91 1.1% Yes
65 -3.17 92 -4.43 -1.26 Lucas Williamson MEM G Undrafted 493 5.9% No
66 -3.17 84 -3.89 -0.72 Malachi Smith BKN G Undrafted 742 9.3% No
67 -3.18 64 -3.23 -0.05 Chris Youngblood OKC G Undrafted 372 4.5% Yes
68 -3.18 90 -4.34 -1.16 Keshon Gilbert WAS G Undrafted 150 1.8% Yes
69 -3.19 77 -3.60 -0.41 Miles Kelly DAL G Undrafted 287 3.4% Yes
70 -3.19 76 -3.51 -0.32 Hayden Gray UTA G Undrafted 54 0.6% Yes
71 -3.19 21 -1.75 +1.44 Myron Gardner MIA F Undrafted 889 10.5% No
72 -3.19 78 -3.60 -0.41 Hunter Sallis PHI G Undrafted 55 0.7% Yes
73 -3.19 97 -5.19 -2.00 Bez Mbeng UTA G Undrafted 1,083 12.8% No
74 -3.20 45 -2.79 +0.41 Cormac Ryan MIL G Undrafted 537 6.7% No
75 -3.23 83 -3.88 -0.66 Norchad Omier LAC F Undrafted 46 0.6% Yes
76 -3.23 51 -2.88 +0.35 Alex Morales ORL G Undrafted 46 0.6% Yes
77 -3.23 60 -3.14 +0.09 Kadary Richmond WAS G Undrafted 149 1.8% Yes
78 -3.23 54 -2.96 +0.27 John Poulakidas DAL G Undrafted 546 6.5% No
79 -3.25 91 -4.34 -1.10 Javonte Cooke POR G Undrafted 198 2.4% Yes
80 -3.25 35 -2.35 +0.90 Tristan Enaruna CLE F Undrafted 170 2.1% Yes
81 -3.25 48 -2.84 +0.41 Chaney Johnson BKN G-F Undrafted 719 9.0% No
82 -3.25 70 -3.36 -0.12 Andersson Garcia UTA F Undrafted 359 4.2% Yes
83 -3.25 69 -3.36 -0.11 Jahmyl Telfort LAC G Undrafted 63 0.8% Yes
84 -3.25 96 -4.93 -1.68 Tyler Burton MEM F Undrafted 646 7.8% No
85 -3.25 82 -3.73 -0.48 Payton Sandfort OKC F Undrafted 133 1.6% Yes
86 -3.27 20 -1.69 +1.57 Blake Hinson UTA F Undrafted 607 7.2% No
87 -3.27 99 -5.56 -2.29 Adama Bal MEM G Undrafted 524 6.3% No
88 -3.28 68 -3.35 -0.07 Jayson Kent POR F Undrafted 43 0.5% Yes
89 -3.28 59 -3.08 +0.20 Alex Antetokounmpo MIL F Undrafted 43 0.5% Yes
90 -3.28 95 -4.79 -1.51 Toby Okani MEM F Undrafted 477 5.7% No
91 -3.29 47 -2.80 +0.48 Josh Oduro NOP C Undrafted 186 2.2% Yes
92 -3.29 86 -4.09 -0.79 Julian Reese WAS F Undrafted 840 10.1% No
93 -3.30 24 -1.83 +1.47 Dylan Cardwell SAC C Undrafted 1,851 22.7% No
94 -3.35 56 -2.99 +0.36 CJ Huntley PHX F Undrafted 82 1.0% Yes
95 -3.35 22 -1.77 +1.58 Moussa Cisse DAL C Undrafted 1,109 13.2% No
96 -3.36 62 -3.20 +0.16 Vladislav Goldin MIA C Undrafted 57 0.7% Yes
97 -3.36 61 -3.20 +0.16 Lawson Lovering MEM C Undrafted 110 1.3% Yes
98 -3.38 88 -4.29 -0.91 Hunter Dickinson NOP C Undrafted 95 1.1% Yes
99 -3.38 72 -3.37 +0.01 Grant Nelson BKN F Undrafted 68 0.9% Yes
100 -3.40 66 -3.31 +0.09 Rocco Zikarsky MIN C Drafted 1-60 45 72 0.9% Yes