{"schemaVersion":"si-citable-statistic@1.1.0","slug":"benchmark-mismatch-severity","title":"Declared-benchmark mismatches by severity","sentence":"The run classified 107 declared-benchmark mismatches: 88 changed index families and 19 stayed within adjacent broad-market or small-cap families.","metrics":[{"label":"Style-family disagreement","value":"88","numericValue":88,"unit":"funds","observations":88},{"label":"Mild adjacent-index mismatch","value":"19","numericValue":19,"unit":"funds","observations":19},{"label":"Declared benchmark matched best fit","value":"93","numericValue":93,"unit":"funds","observations":93}],"vintageCutoff":"2026-07-31","asOfBasis":"Registry vintage cutoff; input rows retain their own SEC source-event periods.","portfolioEventPeriods":{"start":"2026-05-29","end":"2026-07-31","distribution":[{"date":"2026-05-29","observations":11},{"date":"2026-05-31","observations":32},{"date":"2026-06-30","observations":110},{"date":"2026-07-31","observations":47}]},"expenseEventPeriods":null,"temporalCoverage":{"start":"2026-05-29","end":"2026-07-31"},"publishedAt":"2026-10-01T15:39:37.108Z","sourcePublishedAt":"2026-10-01T15:39:37.108Z","runId":"b96ba376-9e4c-41d2-a6d2-e4caaf855632","methodologyVersion":"closet-index@3.0.0","cohortVersion":"cohort-v2@2026-07-24","verificationUrl":"/data/statistics/vintages/2026-07-31/b96ba376-9e4c-41d2-a6d2-e4caaf855632/benchmark-mismatch-severity.json","citation":"Sensible Investor (vintage cutoff 2026-07-31; portfolio events 2026-05-29 through 2026-07-31), “Declared-benchmark mismatches by severity,” closet-index@3.0.0; verification: https://sensible-investor.com/data/statistics/vintages/2026-07-31/b96ba376-9e4c-41d2-a6d2-e4caaf855632/benchmark-mismatch-severity.json.","method":"Compare the declared proxy family with the computed best-fit proxy family. S&P 500, Russell 1000, and total US market are adjacent broad-market indexes; S&P SmallCap 600 and Russell 2000 are adjacent small-cap indexes. Other family changes are style-family disagreements.","traceSample":[{"seriesId":"S000004418","declaredProxy":"IWD","bestFitProxy":"IVV","benchmarkMismatch":"mismatch"},{"seriesId":"S000003846","declaredProxy":"IWB","bestFitProxy":"IWD","benchmarkMismatch":"mismatch"},{"seriesId":"S000048334","declaredProxy":"VTI","bestFitProxy":"IWF","benchmarkMismatch":"mismatch"}],"source":{"manifestSha256":"9499c060a7e07bdaa0b179fa402fcc37be846cc192e6016f081b5c8006d7e2a7","csvSha256":"11ad653d111078338261203cb229e09d1e917dce8e7dc14f6dfeea51c1497738","jsonSha256":"c1c8f1486749b6e1df5f902aa6d86e48df545d87cdf845e39d8bc1585c94865e","statisticsSource":{"url":"/data/statistics/sources/vintages/2026-07-31/b96ba376-9e4c-41d2-a6d2-e4caaf855632/benchmark-mismatch-severity.json","sha256":"d9d2c4b57433ca60705f62bf54fa3dff7f7fc309b3018a96e74feb2b681d1cc4","retrievedAt":"2026-10-01T15:20:17.430Z","publishedAt":"2026-10-01T15:39:37.108Z","license":"https://creativecommons.org/licenses/by/4.0/"}}}