Career Tiers: Star, Starter, Contributor, Bust
Data Dictionary · how NFL career outcomes are classified
Career tiers are the four-way classification of completed NFL careers used across the platform: Star, Starter, Contributor, and Bust. Each drafted prospect with a finished career window is assigned a tier from his fantasy value over replacement (VBD) percentile within his position cohort. The tiers are the outcome labels that the DMX model is trained on and validated against.
The four tiers — and the base rates
Across every offensive prospect from the 2001–2020 draft classes with a completed career window (n = 1,853), here is how careers actually distributed:
| Tier | Share | N | What it means |
|---|---|---|---|
| Star | 13.5% | 251 | Top-of-position difference-maker; league-winning stretches |
| Starter | 12.8% | 237 | Multi-year lineup piece with real positional value |
| Contributor | 22.8% | 422 | Flex/streamer seasons, short peaks, depth value |
| Bust | 50.9% | 943 | Negligible dynasty return on the pick |
Offensive prospects, draft classes 2001–2020, career tier labeled. Live counts from the public database.
The headline number is the last row: half of all drafted skill-position players bust, and only about one in four becomes a Star or long-term Starter. That base rate is the backdrop for every rookie pick you'll ever make — the question is never “will this player hit?” but “does anything about this profile beat a coin flip that's rigged 3-to-1 against me?” Scoring models exist to move you off that base rate: the top DMX decile hits at 54.9% versus 5.6% for the bottom decile (full table in the DMX guide).
How tiers are assigned
Tiers are deterministic, not editorial. A player's career VBD is computed over a fixed post-draft window, ranked against his position cohort, and the percentile maps to a tier. Nobody is voting; a borderline player two percent below the Starter boundary is classified Contributor even if his career “feels” Starter-adjacent. That arbitrariness at the boundaries is a documented limitation — the continuous VBD values are published alongside the labels precisely so you can see how close a player sat to the line.
Why the model predicts tiers, not points
The published validation shows tier regressions explaining roughly 2× the variance of continuous fantasy-point regressions (tier-ordinal R² of 0.192–0.326 across positions, versus 0.072–0.164 for exact VBD — all twelve regressions are in the whitepaper). Careers cluster into archetypes much more cleanly than they distribute along exact point totals: predicting which kind of career a prospect gets is a more learnable problem than predicting his precise point total — and for dynasty decisions, it's also the more useful one.
Where you'll see tiers
The Draft Board shows each historical prospect's actual outcome tier next to his DMX score — that pairing is the model's track record laid bare, class by class. The Analytics page uses tiers for residual analysis: the Stars the model scored low and the Busts it scored high are ranked leaderboards, not buried mistakes.
Frequently asked questions
What percentage of drafted NFL skill players bust?
In the 2001-2020 draft classes with completed career windows, 50.9% of offensive skill-position prospects (943 of 1,853) finished as Busts - careers with negligible fantasy value over replacement. Only about 26% became Stars or long-term Starters.
What counts as a Star career?
A career in the top band of fantasy value over replacement (VBD) within the player's position cohort - roughly the top 13-14% of outcomes. Tiers are assigned deterministically from VBD percentiles, not by opinion.
Are career tiers subjective?
No. They're computed from career VBD percentiles within position cohorts. The boundary placement is somewhat arbitrary - a player just below a threshold gets the lower tier - which is why the continuous values are published alongside the labels.
Can a player's tier change?
A tier is assigned once the career window used for labeling is complete, so it's stable. Active players don't have a final tier yet - their current dynasty value is tracked by DPX instead.