I made a mistake in these calculations. They should be:
Season | Transfers' aggregate 3pt% change from prior year | Team 3pt attempt rate
2020-21 | +3.6% | 30.0
2022-23 | -2.1% | 41.9
2023-24 | -1.9% | 38.6
2024-25 | -6.2% | 47.2
2025-26 | -8.3% | 49.7
Or, if you want to exclude players coming from non-power conferences:
Season | Transfers' aggregate 3pt% change from prior year | Team 3pt attempt rate
2020-21 | +2.5% | 30.0 |
2022-23 | -2.1% | 41.9
2023-24 | +2.7% | 38.6
2024-25 | -6.7% | 47.2
2025-26 | -8.3% | 49.7
These look even more correlated with our 3pt attempt rate except for 2023-24. And while the sample sizes are small, some of the differences are large enough to still be meaningful. For this past season, there's an 87% chance that the difference isn't due to variance, and 88% for the prior year's class. There's only a 60% chance that variance doesn't explain why the 2023-24 transfers shot better.
Are there any thoughts on an explanation of why this is besides a statistical anomaly or a curse? Different conditioning, more pressure to succeed (meaning step up in competition), more difficult shots (off-the-dribble, off a screen, in the corner, etc.)....?
I was living on the side of the aisle where it didn't seem like there was any way that it would make sense for there to be a true difference for transfers to shoot more poorly when they came to Illinois, but it seems like there's enough irrefutable evidence to suggest otherwise...
If you look at the other side of the transfer flow, if you look at guys who transferred out, you notice a similar pattern:
Tre White: 32.9% in 2025 -> 40.3% in 2026
DGL: 25.5% in 2025 -> 40.8% in 2026
Carey Booth: 24% in 2025 (on limited opportunities) -> 41.2% in 2026
Luke Goode 38.9% in 2024 -> 39.2% in 2025 (virtually the same)
Jayden Epps: 30.1% in 2023 -> 30.5% in 2024 (virtually the same)
Skyy Clark: 33.3% in 2023 -> 35.4% in 2024
RJ Melendez: 26.4% in 2023 -> 30.4% in 2024
Jacob Grandison: 41% in 2022 -> 33.7% in 2023 (only drop i could find in limited research)
These ones have easier explanations in a vacuum but when you consider the main argument, seems like another data point to suggest that there is something about being at Illinois that leads to transfers (both in and out) having a worse shooting % while they're at Illinois.