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5 Commits
| Author | SHA1 | Message | Date | |
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 builtbykev
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6b17f79367 |
Per-archetype re-audit: no slot reaches 500, and the replication unit
decided everything The premise does not hold. prove-hit-factors.js has no date filter anywhere in it and pages the full table -- there was never a window to widen. Full clean history is 1,266 rows, not 2,715. platoon was not "proved" last session, it was explicitly held on 4.5%-median-contaminated season-to-date splits, and pitcher_contact_profile was demoted. The proven set going in was one factor, not three. STEP 1: no archetype slot reaches n>=500 on full history. Best is BOMBER at 408, and BOMBER is the most common archetype on the board. GHOST 173, BRUSH 64, DRIVER 43, CATALYST 16. These are confirmed genuinely short, not artifacts. STEP 2 is where the real finding is. park_hits initially PROVED at 619 rows across 45 games -- but those games only ever visited 14 distinct park values. A park effect is replicated across parks, and unmodelled park heterogeneity is confounded with the thing being estimated. Each factor is now clustered on the coarser of the game and the entity its treatment rides on. That flipped two verdicts and confirms Kev's causal-correctness thesis from a new direction: defense_by_direction has 442 hitter-team units of replication where crude team defense has 26. The correct atom is not just more accurate, it is the only one measurable at all. park_hits (14) and defense (26) can never be validated however long the ledger runs -- the same ceiling as park dimensions, reached independently. Also fixed a bar I got wrong last session: I transplanted the 500-row floor onto clusters, which refused a factor with 1,059 rows over 85 games while answering neither question. Two floors now -- rows>=500 for a stable estimate, clusters>=40 for a trustworthy interval. Not a lowered bar: park_hits and defense are still refused. PROVEN: defense_by_direction only, pooled, [-0.0054,-0.0012] at 99 tests. It stays POOLED-ONLY -- no per-archetype reasoning wired, nothing grandfathered. The card must not say "GHOST: defence matchup strong" because we have not earned that sentence. The predicted fingerprint did not appear either: BOMBER -0.0036 vs GHOST -0.0024, the opposite direction, both noise-dominated. Recorded so it is not claimed later. RESCALE: NOT READY. One proven factor worth -0.0031 Brier. Rescaling on that is relabelling. Counter and frozen clusters byte-identical. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1sivYNqY2TS5ftykmHBU9 |
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builtbykev
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7b85934dc3 |
Under-querying vs out of data: the answer depends on the unit
The platoon test's n=452 described how much of the JOIN survived, not how much data exists. There are 1,266 clean settled hits rows and zero quarantined ones. platoon_splits had been ingested from tonight's lineups only (315 players), so any hitter who settled a prop without appearing in an ingest-day lineup was silently absent from every test. Backfilled all 380 hitters (81 fetched, 0 unresolved). Re-ran on 1,059 rows, up from 452. THE DEMOTION IS THE HEADLINE. pitcher_contact_profile, the strongest proven factor in the programme (-0.0064, CI [-0.0113,-0.0014]), roughly halved to -0.0034 on more than double the sample and its corrected interval now spans zero. The Bonferroni denominator also rose to 55, which widens every interval -- but a denominator cannot move a point estimate, and that halved on its own. platoon and platoon_severity now clear the bar and are NOT promoted. Upper bound -0.0001, on season-to-date splits that contain the games they predict: measured contamination is 4.5% median, 12.4% at p90, 137% worst. I had assumed ~1%. They stay CANDIDATE pending point-in-time splits. GAME-LEVEL IS A DIFFERENT PROBLEM. game_context held zero weather rows ever -- not because the fetcher was wrong (it correctly targets Open-Meteo's archive) but because ledger_entries keys a game as mlb:2026-08-03:Away@Home and game_context keys it as mlb:823437. Every lookup missed and NULL columns read as honest absence. Third occurrence of that class. Fixed the join: 96/101 settled games now carry actual archived weather, park dimensions backfilled 15 -> 30 venues. But 928 total_bases rows sit on 47 games at 17.6 rows per game. Park and weather assign one value per game, so resampling rows would have manufactured a pass. factorGate now resamples clusters when rows carry one and judges sample against effective_n; unclustered rows keep the original path byte-for-byte. Verdict: 47 clusters < 500, and the point estimate is +0.0011 -- worse, not merely unproven. Weather needs ~57 more days. Park dimensions need never: there are 30 ballparks in MLB, so a venue-constant factor can never reach 500 independent units. That bar was built for player-level factors and does not transfer. Wind is refused. We have speed and bearing for all 96 games; we lack park orientation, and 220 degrees is blowing out at one park and in at another. Using speed alone would assert an effect while discarding the sign that decides what it is. Counter and frozen clusters untouched. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1sivYNqY2TS5ftykmHBU9 |
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builtbykev
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6452926732 |
Retain raw weather, and record platoon severity 48 rows short
Two fixes in the weather path, and the second was hiding behind the first. The scalar weather_mod cannot express a hit-TYPE conversion at all -- wind out and warm turning fly balls into extra bases, and cold heavy air turning them into outs, collapse to the same number once multiplied -- so the raw temperature, wind speed and wind direction are now retained alongside it. And the old guard only kept the environment when the multiplier was not 1, which silently discarded the forecast for every ordinary night. That is the majority of games, and precisely the rows a hit-type model would need in order to learn what ordinary looks like. Platoon severity is built and measured at n=452, which is 48 rows short of the gate: CANDIDATE_PENDING, neither proven nor theatre. It moves less than flat platoon (0.021 against 0.026), consistent with the pattern, and its Brier point estimate is favourable but the corrected interval still spans zero. Worth naming: the refusal costs sample, and that is the design working. Flat platoon scores 741 rows because it will happily apply a boost to anyone; severity scores 452 because the other 289 are hitters whose split we cannot actually read at 60 plate appearances on the short side. Buying those rows back by shrinking instead of refusing would have produced a number indistinguishable from a measured league-average split, which is a different claim from the one the data supports. Park dimensions are ingested and verified in production across fifteen venues, joined by the venue the game is actually at rather than inferred from the home team -- neutral-site and international games break that assumption without surfacing an error. The park-and-weather-to-hit-type atom is NOT built. Its inputs landed this session and carry a single as_of date, so testing it on total_bases would be scoring games with inputs that postdate them. Building it now would produce something plausible rather than something proven. Proven factors for hits remain pitcher_contact_profile and defense_by_direction. 4,307 tests green (344 suites); web build exit 0. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1sivYNqY2TS5ftykmHBU9 |
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builtbykev
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20c45cbcd1 |
The causally-correct defence atom proves where the crude one did not
Kev's insight holds, and the data says so cleanly. defense_by_direction PROVES on hits -- n=528, Brier -0.0034, interval [-0.0059, -0.0009] at the 99.9% level the cumulative correction now demands -- while team-average defence remains not proven, its interval still spanning zero. Same signal, same rows, different unit. The detail worth keeping is that the causally-correct atom moves the number LESS THAN HALF as much as the crude one, 0.013 against 0.030, and is the one that is reliably right. The team average was moving more and knowing less. Big movement is not evidence of a good factor; it is frequently the tell. Both halves turned out to be free, as the order expected. Savant's batted-ball leaderboard carries pull/straight/oppo crossed with ground/air for 609 hitters -- the statcast leaderboard we already pull does not, it has nineteen columns and no direction at all -- and the OAA feed already carries each fielder's position, so per-position defence is a regrouping of last week's ingest rather than a new source. Verified in production: 609 spray profiles, 31 teams. Handedness is what joins them and getting it backwards would have been invisible. Pull for a right-handed hitter is the left side; for a left-handed hitter it is the right side. A model that ignored `bats` would send half the league's grounders to the wrong infielders and still look like it was reading defence, and nothing downstream would have caught it. Switch hitters bat opposite the pitcher, which this does not resolve, so they are unreadable rather than guessed. Unmeasured zones are renormalised away rather than contributing a zero, since a zero asserts an exactly-average fielder standing there, and coverage states honestly what share of a hitter's contact we could actually read. ATOM 2 is input-blocked rather than sample-blocked, and the distinction matters because waiting will not fix it. The weather free-source check passes -- Open-Meteo is already wired and exposes temperature, wind speed, wind direction and precipitation -- but those raw fields are collapsed into a single scalar modifier and wx_forecast is empty on all 1,119 settled rows. Park DIMENSIONS are not ingested at all; parkFactors holds coefficients, not wall heights or fence distances. A park-and-weather-to-hit-type conversion needs both, so it is scoped rather than half-built: retaining the raw weather fields is the cheap half, dimensions are the missing one. Proven factors for hits are now pitcher_contact_profile and defense_by_direction, both pooled; every per-archetype slot remains sample-blocked. 4,297 tests green (342 suites); web build exit 0. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1sivYNqY2TS5ftykmHBU9 |
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builtbykev
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a9ee55550b |
Build the two-part factor gate: one factor proves, and zero are theatre
The question was whether the hit grade reads tonight's game or just says he is due. Answering it needed a gate that correlation cannot provide, because correlation cannot separate the two ways a factor looks alive: it reads the game, or it moves the number and reads nothing. The second is what a product ships by accident -- arch-v1 moved 76% of rows by 2.5 points, changed resolution by 0.0000, and was live for months, and no user could have told. So a factor must now clear both conditions: move the prediction off the player's own leave-one-out base rate, AND improve out-of-sample Brier. Brier rather than correlation, because correlation asks whether the ordering improved and this asks whether the NUMBER got closer to what happened -- and for a graded probability the number is the product. The correction applies to the interval itself, which turned out to matter more than expected. A plain 95% CI is the right bar for one test; at fifty cumulative tests roughly two or three intervals exclude zero by chance alone. Widening to 1 - 0.05/tests, currently 99.9%, flipped both defence and platoon out of "proves". A 95% interval would have shipped two unproven factors into the grade, with reasoning text explaining them to users. That forced a distinction I had initially collapsed. Defence and platoon have FAVOURABLE point estimates whose corrected intervals merely span zero, and calling that THEATER would repeat the error this codebase keeps correcting: insufficient evidence is not evidence of absence. THEATER is now reserved for its one real meaning -- moves the number, reads nothing -- and NOT_PROVEN_AT_CORRECTED_BAR names a real candidate held to a bar that rises with every hypothesis the programme tests. Result on 741 settled hits rows: pitcher_contact_profile PROVES, improving Brier by 0.0066 with a 99.9% interval of [-0.0114, -0.0016]. Defence (-0.0043) and platoon (-0.0039) are not proven at the corrected bar. Park is sample-blocked at n=405. Zero factors are theatre, which is the genuinely good news: nothing decorative is being wired. Per-archetype every slot is sample-blocked (BOMBER 252-294, GHOST 67-125). Two spec gaps worth recording. The approach identities the order names -- SPRAY, DAMAGE-DEALER, COUNT-WORKER -- do not exist in the registry; the MLB batter archetypes are BOMBER, GHOST, TORCH, BRUSH, DRIVER, FLEX, ALPHA, HYBRID and CATALYST. And parkFactors maps hits to run_base, so there is no hits-specific park factor at all: a park that turns outs into hits without producing runs is invisible to the input we have. The grade rescale is NOT run. It was explicitly gated on the factor proving, and one pooled factor worth 0.0066 of Brier is not a factor-informed distribution -- rescaling on it would dress a base-rate model as a matchup model, which is the exact thing this gate was built to prevent. 4,286 tests green (340 suites); web build exit 0. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1sivYNqY2TS5ftykmHBU9 |