{"sport":"mlb","slug":"jim-jackson","bio":{"fullName":"Jim Jackson","position":"LF","team":"CLE","heightInches":66,"weightLbs":165,"birthDate":"1877-11-28","rookieSeason":1901,"lastSeason":1906,"status":"RET","externalIds":{"mlbam":"116430","chadwick":"6adb2f3f","retro":"jackj103","wikidata":"Q6195861"}},"draft":null,"statTables":[{"id":"batting","label":"Batting","columns":[{"key":"g"},{"key":"ab"},{"key":"r"},{"key":"h"},{"key":"doubles"},{"key":"triples"},{"key":"hr"},{"key":"rbi"},{"key":"sb"},{"key":"bb"},{"key":"so"},{"key":"avg"},{"key":"obp"},{"key":"slg"},{"key":"ops"}],"rows":[{"season":1901,"seasonType":"REG","team":"Baltimore Orioles","gamesPlayed":99,"values":{"g":99,"ab":364,"r":42,"h":91,"doubles":17,"triples":3,"hr":2,"rbi":50,"sb":11,"bb":20,"so":null,"avg":0.25,"obp":0.291,"slg":0.33,"ops":0.621},"rowScope":"team"},{"season":1902,"seasonType":"REG","team":"SF","gamesPlayed":37,"values":{"g":37,"ab":110,"r":14,"h":20,"doubles":5,"triples":1,"hr":0,"rbi":13,"sb":6,"bb":15,"so":null,"avg":0.182,"obp":0.28,"slg":0.245,"ops":0.525},"rowScope":"team"},{"season":1905,"seasonType":"REG","team":"CLE","gamesPlayed":110,"values":{"g":110,"ab":426,"r":59,"h":109,"doubles":12,"triples":4,"hr":2,"rbi":31,"sb":15,"bb":34,"so":null,"avg":0.256,"obp":0.317,"slg":0.317,"ops":0.634},"rowScope":"team"},{"season":1906,"seasonType":"REG","team":"CLE","gamesPlayed":105,"values":{"g":105,"ab":374,"r":44,"h":80,"doubles":13,"triples":2,"hr":0,"rbi":38,"sb":25,"bb":38,"so":null,"avg":0.214,"obp":0.29,"slg":0.259,"ops":0.549},"rowScope":"team"}],"careerTotals":{"REG":{"g":351,"ab":1274,"r":159,"h":300,"doubles":47,"triples":10,"hr":4,"rbi":132,"sb":57,"bb":107,"so":null,"avg":0.235,"obp":0.298,"slg":0.297,"ops":0.595}}},{"id":"advanced","label":"Advanced (League-Relative)","columns":[{"key":"ops_plus","label":"OPS+","description":"On-base plus slugging vs the player's own season+league (100 = league average). Park-unadjusted; OBP uses a consistent (H+BB)/(AB+BB) rate. Higher is better.","format":"int","higherIsBetter":true},{"key":"era_plus","label":"ERA+","description":"Earned-run average vs the player's own season+league (100 = league average). Park-unadjusted. Higher is better.","format":"int","higherIsBetter":true}],"rows":[{"season":1901,"seasonType":"REG","team":"Baltimore Orioles","values":{"ops_plus":78,"era_plus":null},"rowScope":"team"},{"season":1902,"seasonType":"REG","team":"SF","values":{"ops_plus":68,"era_plus":null},"rowScope":"team"},{"season":1905,"seasonType":"REG","team":"CLE","values":{"ops_plus":107,"era_plus":null},"rowScope":"team"},{"season":1906,"seasonType":"REG","team":"CLE","values":{"ops_plus":78,"era_plus":null},"rowScope":"team"}],"careerTotals":{"REG":{"ops_plus":86,"era_plus":null}},"advancedMeta":{"method":"computed in-house from MLB StatsAPI season batting/pitching lines, normalized to each player's own (season, league) baseline","formulas":{"era_plus":"100 * lgERA / playerERA (league ERA = 9 * ΣER / ΣIP over the season+league)","ops_plus":"100 * (OBP/lgOBP + SLG/lgSLG - 1)","career_era_plus":"innings-weighted league ERA / career ERA (B-Ref method)","career_ops_plus":"AB-weighted OBP & SLG against AB-weighted league rates"},"caveats":["PARK-UNADJUSTED: no park-factor data exists in the corpus, so these are league-relative but not park-adjusted (true B-Ref ERA+/OPS+ also divide by a park factor)","OBP baseline uses a consistent (H+BB)/(AB+BB) reached-base rate for BOTH player and league — the source feed carries no HBP or SF, so this is not the full (H+BB+HBP)/(AB+BB+HBP+SF) OBP; SLG is exact from the hit-type columns","league resolved from team code + season (most-recently-founded franchise existing by that season); the same resolver builds the baseline and looks up the player, so ratios stay internally coherent","a (season, league) bucket below the sample floor (3000 AB batting / 1000 IP pitching) yields null — no noisy baselines","regular season only; postseason lines are excluded from league baselines and metrics","AL and NL and each historical/Negro league are normalized separately — never blended across leagues or eras"]}}],"dataSources":["MLB StatsAPI (statsapi.mlb.com — official public league API; facts only, raw payloads not republished)"],"generatedAt":"2026-07-03T08:01:23.026Z"}