DBCLE#0RES

Mark Harper

Height5'9"

Weight174 lb

BornNov 5, 1961

Age64

CollegeAlcorn State See College Stats

Rookie yr1986

Encyclopedia Coverage3/8 data layers

StatVault aggregates multiple open-licensed and proprietary sources into a single profile. The depth indicator above shows which layers are available for this player.

Bio & DraftBirth date, height/weight, draft round/pick, college — sourced from nflverse players.csv (CC-BY 4.0). Covers all NFL eras.

Season Stats (1999–present)Not available for this player

Advanced (EPA, 1999–present)Not available for this player

Snap Counts (2012–present)Not available for this player

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Defensive StatsNot available for this player

College StatsCollege attribution is present, but this profile artifact does not yet carry a parsed college stat table.

NFL Combine / Pro DayNot available for this player

Proprietary LayersKV-H (Knox Value-Historical) — era-normalized career rating 0–100 calibrated within position group (1999+ coverage). SIS (Snap Impact Score, 2012+) — per-snap production z-scored within position. VORP — value over replacement player. Durability IQ — games-played percentile adjusted for era.

Pre-1999 players have bio + draft data but counting stats are not available from any freely-licensed source. Players with ★ Career Only see verified career aggregates from nflverse draft_picks.

Where this data comes from

Modern-era stats (1999+) come from nflverse's open data releases. Pre-1999 seasons are backfilled additively from Wikipedia and NFL.com's own official season pages — never from rights-restricted sources.

nflverse — CC-BY 4.0 — attribution required
Wikipedia — Facts extracted under Feist v. Rural Telephone; courtesy CC-BY-SA attribution
NFL.com — Official league site; facts extracted under Feist, courtesy attribution

Methodology · Trust Center

Understanding These Stats

Proprietary StatVault Metrics

KV-H (Knox Value-Historical) — Era-normalized career rating 0–100 within position group, calibrated so a 50 = average starter and 90+ = all-time great. Covers 1999–present. Built on a 5-year IQR/robust-std era window.

SIS (Snap Impact Score) — Per-snap production z-scored within position group and era (2012+). Measures how much a player produced per opportunity, not raw volume.

VORP (Value Over Replacement) — Sum of max(0, season KV-H − positional replacement level) across a career. Measures career value above the minimum-roster baseline at each position.

Durability IQ — 0–100 score reflecting how many games a player played relative to peers at the same position in the same era. Adjusts for injury-shortened seasons.

College Stats

Alcorn StateCollege listed; stat table pending import

College stats are not imported for this profile yet.

StatVault has the verified college attribution (Alcorn State), but no parsed college box-score table is present in this profile artifact. The section stays here so every profile has a consistent college-stats landing point without fabricating unavailable rows.

Athletic & Unique Profile

verified measurements and curated source-tagged facts

5'9" / 174 lb

Frame

Data: nflverse:players · multi-source verified via the StatVault Oracle · updated 8/31/2026