{"abstract":"Bond-equivalent yields for short bills are understated.","category":"Bond day-count conventions","checks":8,"contract":"Inputs settlement and maturity [y,m,d] (1 to 364 days apart) and discount rate d. t = days. Price = 100*(1 - d*t/360). Year basis B is 366 if a 29 February lies in (settle, settle+365 days], else 365. For t <= B/2, BEY = B*d/(360 - d*t); otherwise BEY solves the quadratic with a = t/(2B) - 0.25, b = t/B, c = (price-100)/price, taking (-b + sqrt(b^2 - 4ac))/(2a). Return [price rounded 6, BEY rounded 8].","evaluation_group":"w2-bond_day_count_conventions-bill-discount-to-bey","failed_approach":"Adding d*t in the denominator moves the error in the other direction.","family":"w2-bond_day_count_conventions-bill-discount-to-bey-short-bill-yield-denominator","id":"FA-61116","implementations":{"attempt":{"sha256":"90f350b318b970ab3217209afc84edd832c06c808e30da3e179dcbcd54b111e6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport datetime\nimport math\nN = 1\nobservations = []\ndef solve(settle, maturity, d):\n    S = datetime.date(*settle)\n    M = datetime.date(*maturity)\n    t = (M - S).days\n    def leap(y):\n        return (y % 4 == 0 and y % 100 != 0) or y % 400 == 0\n    horizon = S + datetime.timedelta(days=365)\n    basis = 366 if any(leap(y) and S < datetime.date(y, 2, 29) <= horizon for y in (S.year, S.year + 1)) else 365\n    price = 100 * (1 - d * t / 360)\n    if t <= basis / 2:\n        bey = basis * d / (360 + d * t)\n    else:\n        a = t / (2 * basis) - 0.25\n        b = t / basis\n        c = (price - 100) / price\n        bey = (-b + math.sqrt(b * b - 4 * a * c)) / (2 * a)\n    return [round(price, 6), round(bey, 8)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression short bill yield denominator 1', [[2008, 4, 28], [2008, 10, 27], 0.025], [98.736111, 0.02567168]], ['regression short bill yield denominator 2', [[2100, 11, 3], [2101, 2, 2], 0.001], [99.974722, 0.00101415]], ['partial repair probe 1', [[2001, 8, 5], [2002, 2, 3], 0.01], [99.494444, 0.01019041]], ['partial repair probe 2', [[2008, 12, 1], [2009, 5, 31], 0.0525], [97.360417, 0.05467229]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2099, 1, 15], [2099, 7, 19], 0.0525], [97.302083, 0.05468486]], ['normal control 2', [[2077, 2, 21], [2078, 2, 20], 0.08], [91.911111, 0.08638888]], ['normal control 3', [[2021, 6, 30], [2021, 12, 30], 0.0435], [97.78875, 0.04509869]]], [['regression short bill yield denominator 1', [[2018, 8, 17], [2019, 2, 12], 0.025], [98.756944, 0.02566627]], ['regression short bill yield denominator 2', [[2066, 12, 28], [2067, 6, 21], 0.001], [99.951389, 0.00101438]], ['partial repair probe 1', [[2001, 4, 12], [2001, 10, 11], 0.08], [95.955556, 0.08452987]], ['partial repair probe 2', [[2011, 6, 12], [2011, 9, 11], 0.08], [97.977778, 0.08301202]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2028, 2, 1], [2028, 10, 13], 0.0435], [96.91875, 0.04534078]], ['normal control 2', [[2091, 2, 28], [2091, 9, 1], 0.025], [98.715278, 0.02567265]], ['normal control 3', [[2062, 2, 28], [2062, 8, 30], 0.01], [99.491667, 0.01019055]]], [['regression short bill yield denominator 1', [[2035, 5, 30], [2035, 8, 29], 0.025], [99.368056, 0.02557831]], ['regression short bill yield denominator 2', [[2056, 4, 1], [2056, 7, 1], 0.01], [99.747222, 0.01016458]], ['partial repair probe 1', [[2060, 12, 28], [2061, 6, 21], 0.08], [96.111111, 0.08439306]], ['partial repair probe 2', [[2048, 7, 14], [2048, 10, 13], 0.0525], [98.672917, 0.05394506]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2037, 6, 21], [2038, 6, 20], 0.0525], [94.691667, 0.05544668]], ['normal control 2', [[2013, 6, 28], [2013, 12, 28], 0.08], [95.933333, 0.08453969]], ['normal control 3', [[2028, 3, 15], [2028, 9, 18], 0.001], [99.948056, 0.0010144]]], [['regression short bill yield denominator 1', [[2023, 1, 15], [2023, 3, 27], 0.0435], [99.142083, 0.04448582]], ['regression short bill yield denominator 2', [[2085, 8, 28], [2086, 2, 25], 0.025], [98.743056, 0.02566988]], ['partial repair probe 1', [[2012, 9, 28], [2013, 3, 28], 0.0525], [97.360417, 0.05467229]], ['partial repair probe 2', [[2013, 1, 12], [2013, 4, 13], 0.01], [99.747222, 0.01016458]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2033, 2, 28], [2033, 8, 30], 0.001], [99.949167, 0.0010144]], ['normal control 2', [[2053, 2, 1], [2053, 8, 3], 0.0435], [97.78875, 0.04509869]], ['normal control 3', [[2078, 1, 23], [2078, 8, 5], 0.025], [98.652778, 0.02567383]]], [['regression short bill yield denominator 1', [[2096, 5, 22], [2096, 8, 21], 0.001], [99.974722, 0.00101415]], ['regression short bill yield denominator 2', [[2053, 1, 13], [2053, 7, 14], 0.0525], [97.345833, 0.05468048]], ['partial repair probe 1', [[2057, 1, 1], [2057, 6, 25], 0.0525], [97.447917, 0.0546232]], ['partial repair probe 2', [[2100, 9, 30], [2101, 3, 31], 0.0435], [97.800833, 0.0450959]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2023, 12, 15], [2024, 12, 13], 0.01], [98.988889, 0.01024442]], ['normal control 2', [[2056, 10, 9], [2057, 4, 10], 0.001], [99.949167, 0.0010144]], ['normal control 3', [[2099, 3, 15], [2100, 3, 14], 0.0525], [94.691667, 0.05544668]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"9275213e45806437e8a5a90c2fa1597abb159967464fe1547ebdb082cecf19bb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport datetime\nimport math\nN = 1\nobservations = []\ndef solve(settle, maturity, d):\n    S = datetime.date(*settle)\n    M = datetime.date(*maturity)\n    t = (M - S).days\n    def leap(y):\n        return (y % 4 == 0 and y % 100 != 0) or y % 400 == 0\n    horizon = S + datetime.timedelta(days=365)\n    basis = 366 if any(leap(y) and S < datetime.date(y, 2, 29) <= horizon for y in (S.year, S.year + 1)) else 365\n    price = 100 * (1 - d * t / 360)\n    if t <= basis / 2:\n        bey = basis * d / 360\n    else:\n        a = t / (2 * basis) - 0.25\n        b = t / basis\n        c = (price - 100) / price\n        bey = (-b + math.sqrt(b * b - 4 * a * c)) / (2 * a)\n    return [round(price, 6), round(bey, 8)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression short bill yield denominator 1', [[2008, 4, 28], [2008, 10, 27], 0.025], [98.736111, 0.02567168]], ['regression short bill yield denominator 2', [[2100, 11, 3], [2101, 2, 2], 0.001], [99.974722, 0.00101415]], ['partial repair probe 1', [[2001, 8, 5], [2002, 2, 3], 0.01], [99.494444, 0.01019041]], ['partial repair probe 2', [[2008, 12, 1], [2009, 5, 31], 0.0525], [97.360417, 0.05467229]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2099, 1, 15], [2099, 7, 19], 0.0525], [97.302083, 0.05468486]], ['normal control 2', [[2077, 2, 21], [2078, 2, 20], 0.08], [91.911111, 0.08638888]], ['normal control 3', [[2021, 6, 30], [2021, 12, 30], 0.0435], [97.78875, 0.04509869]]], [['regression short bill yield denominator 1', [[2018, 8, 17], [2019, 2, 12], 0.025], [98.756944, 0.02566627]], ['regression short bill yield denominator 2', [[2066, 12, 28], [2067, 6, 21], 0.001], [99.951389, 0.00101438]], ['partial repair probe 1', [[2001, 4, 12], [2001, 10, 11], 0.08], [95.955556, 0.08452987]], ['partial repair probe 2', [[2011, 6, 12], [2011, 9, 11], 0.08], [97.977778, 0.08301202]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2028, 2, 1], [2028, 10, 13], 0.0435], [96.91875, 0.04534078]], ['normal control 2', [[2091, 2, 28], [2091, 9, 1], 0.025], [98.715278, 0.02567265]], ['normal control 3', [[2062, 2, 28], [2062, 8, 30], 0.01], [99.491667, 0.01019055]]], [['regression short bill yield denominator 1', [[2035, 5, 30], [2035, 8, 29], 0.025], [99.368056, 0.02557831]], ['regression short bill yield denominator 2', [[2056, 4, 1], [2056, 7, 1], 0.01], [99.747222, 0.01016458]], ['partial repair probe 1', [[2060, 12, 28], [2061, 6, 21], 0.08], [96.111111, 0.08439306]], ['partial repair probe 2', [[2048, 7, 14], [2048, 10, 13], 0.0525], [98.672917, 0.05394506]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2037, 6, 21], [2038, 6, 20], 0.0525], [94.691667, 0.05544668]], ['normal control 2', [[2013, 6, 28], [2013, 12, 28], 0.08], [95.933333, 0.08453969]], ['normal control 3', [[2028, 3, 15], [2028, 9, 18], 0.001], [99.948056, 0.0010144]]], [['regression short bill yield denominator 1', [[2023, 1, 15], [2023, 3, 27], 0.0435], [99.142083, 0.04448582]], ['regression short bill yield denominator 2', [[2085, 8, 28], [2086, 2, 25], 0.025], [98.743056, 0.02566988]], ['partial repair probe 1', [[2012, 9, 28], [2013, 3, 28], 0.0525], [97.360417, 0.05467229]], ['partial repair probe 2', [[2013, 1, 12], [2013, 4, 13], 0.01], [99.747222, 0.01016458]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2033, 2, 28], [2033, 8, 30], 0.001], [99.949167, 0.0010144]], ['normal control 2', [[2053, 2, 1], [2053, 8, 3], 0.0435], [97.78875, 0.04509869]], ['normal control 3', [[2078, 1, 23], [2078, 8, 5], 0.025], [98.652778, 0.02567383]]], [['regression short bill yield denominator 1', [[2096, 5, 22], [2096, 8, 21], 0.001], [99.974722, 0.00101415]], ['regression short bill yield denominator 2', [[2053, 1, 13], [2053, 7, 14], 0.0525], [97.345833, 0.05468048]], ['partial repair probe 1', [[2057, 1, 1], [2057, 6, 25], 0.0525], [97.447917, 0.0546232]], ['partial repair probe 2', [[2100, 9, 30], [2101, 3, 31], 0.0435], [97.800833, 0.0450959]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2023, 12, 15], [2024, 12, 13], 0.01], [98.988889, 0.01024442]], ['normal control 2', [[2056, 10, 9], [2057, 4, 10], 0.001], [99.949167, 0.0010144]], ['normal control 3', [[2099, 3, 15], [2100, 3, 14], 0.0525], [94.691667, 0.05544668]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"3d8dd46d1e1f05a3aef22a81beeeffc6f4e579e0066a7b1d385e104fece3ec6d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport datetime\nimport math\nN = 1\nobservations = []\ndef solve(settle, maturity, d):\n    S = datetime.date(*settle)\n    M = datetime.date(*maturity)\n    t = (M - S).days\n    def leap(y):\n        return (y % 4 == 0 and y % 100 != 0) or y % 400 == 0\n    horizon = S + datetime.timedelta(days=365)\n    basis = 366 if any(leap(y) and S < datetime.date(y, 2, 29) <= horizon for y in (S.year, S.year + 1)) else 365\n    price = 100 * (1 - d * t / 360)\n    if t <= basis / 2:\n        bey = basis * d / (360 - d * t)\n    else:\n        a = t / (2 * basis) - 0.25\n        b = t / basis\n        c = (price - 100) / price\n        bey = (-b + math.sqrt(b * b - 4 * a * c)) / (2 * a)\n    return [round(price, 6), round(bey, 8)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression short bill yield denominator 1', [[2008, 4, 28], [2008, 10, 27], 0.025], [98.736111, 0.02567168]], ['regression short bill yield denominator 2', [[2100, 11, 3], [2101, 2, 2], 0.001], [99.974722, 0.00101415]], ['partial repair probe 1', [[2001, 8, 5], [2002, 2, 3], 0.01], [99.494444, 0.01019041]], ['partial repair probe 2', [[2008, 12, 1], [2009, 5, 31], 0.0525], [97.360417, 0.05467229]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2099, 1, 15], [2099, 7, 19], 0.0525], [97.302083, 0.05468486]], ['normal control 2', [[2077, 2, 21], [2078, 2, 20], 0.08], [91.911111, 0.08638888]], ['normal control 3', [[2021, 6, 30], [2021, 12, 30], 0.0435], [97.78875, 0.04509869]]], [['regression short bill yield denominator 1', [[2018, 8, 17], [2019, 2, 12], 0.025], [98.756944, 0.02566627]], ['regression short bill yield denominator 2', [[2066, 12, 28], [2067, 6, 21], 0.001], [99.951389, 0.00101438]], ['partial repair probe 1', [[2001, 4, 12], [2001, 10, 11], 0.08], [95.955556, 0.08452987]], ['partial repair probe 2', [[2011, 6, 12], [2011, 9, 11], 0.08], [97.977778, 0.08301202]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2028, 2, 1], [2028, 10, 13], 0.0435], [96.91875, 0.04534078]], ['normal control 2', [[2091, 2, 28], [2091, 9, 1], 0.025], [98.715278, 0.02567265]], ['normal control 3', [[2062, 2, 28], [2062, 8, 30], 0.01], [99.491667, 0.01019055]]], [['regression short bill yield denominator 1', [[2035, 5, 30], [2035, 8, 29], 0.025], [99.368056, 0.02557831]], ['regression short bill yield denominator 2', [[2056, 4, 1], [2056, 7, 1], 0.01], [99.747222, 0.01016458]], ['partial repair probe 1', [[2060, 12, 28], [2061, 6, 21], 0.08], [96.111111, 0.08439306]], ['partial repair probe 2', [[2048, 7, 14], [2048, 10, 13], 0.0525], [98.672917, 0.05394506]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2037, 6, 21], [2038, 6, 20], 0.0525], [94.691667, 0.05544668]], ['normal control 2', [[2013, 6, 28], [2013, 12, 28], 0.08], [95.933333, 0.08453969]], ['normal control 3', [[2028, 3, 15], [2028, 9, 18], 0.001], [99.948056, 0.0010144]]], [['regression short bill yield denominator 1', [[2023, 1, 15], [2023, 3, 27], 0.0435], [99.142083, 0.04448582]], ['regression short bill yield denominator 2', [[2085, 8, 28], [2086, 2, 25], 0.025], [98.743056, 0.02566988]], ['partial repair probe 1', [[2012, 9, 28], [2013, 3, 28], 0.0525], [97.360417, 0.05467229]], ['partial repair probe 2', [[2013, 1, 12], [2013, 4, 13], 0.01], [99.747222, 0.01016458]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2033, 2, 28], [2033, 8, 30], 0.001], [99.949167, 0.0010144]], ['normal control 2', [[2053, 2, 1], [2053, 8, 3], 0.0435], [97.78875, 0.04509869]], ['normal control 3', [[2078, 1, 23], [2078, 8, 5], 0.025], [98.652778, 0.02567383]]], [['regression short bill yield denominator 1', [[2096, 5, 22], [2096, 8, 21], 0.001], [99.974722, 0.00101415]], ['regression short bill yield denominator 2', [[2053, 1, 13], [2053, 7, 14], 0.0525], [97.345833, 0.05468048]], ['partial repair probe 1', [[2057, 1, 1], [2057, 6, 25], 0.0525], [97.447917, 0.0546232]], ['partial repair probe 2', [[2100, 9, 30], [2101, 3, 31], 0.0435], [97.800833, 0.0450959]], ['boundary control 1', [[2023, 3, 1], [2024, 2, 28], 0.05], [94.944444, 0.05284575]], ['normal control 1', [[2023, 12, 15], [2024, 12, 13], 0.01], [98.988889, 0.01024442]], ['normal control 2', [[2056, 10, 9], [2057, 4, 10], 0.001], [99.949167, 0.0010144]], ['normal control 3', [[2099, 3, 15], [2100, 3, 14], 0.0525], [94.691667, 0.05544668]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic toy contract stated explicitly in the contract field; no claim of conformance to any published convention text. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-bond_day_count_conventions-bill-discount-to-bey-short-bill-yield-denominator","generated_at":"2026-09-29T14:46:52.133705+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Bond accrual and pricing systems depend on exact day-count arithmetic; a single-day error changes settlement cash.","repair":"Use B*d/(360 - d*t).","root_cause":"The simple formula divides by 360 instead of 360 - d*t.","sha256":"7b6f4f7aefc053a28d8dd2288dc9f99d31e4198d123510b5d299ee90ed44e1ae","title":"Discount-basis bill price and bond-equivalent yield: the short-dated yield ignores the price discount · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":44.307,"exit_code":1,"observations":[{"actual":[98.736111,0.02503086],"check":"regression short bill yield denominator 1","expected":[98.736111,0.02567168],"passed":false},{"actual":[99.974722,0.00101363],"check":"regression short bill yield denominator 2","expected":[99.974722,0.00101415],"passed":false},{"actual":[99.494444,0.01008789],"check":"partial repair probe 1","expected":[99.494444,0.01019041],"passed":false},{"actual":[97.360417,0.05186027],"check":"partial repair probe 2","expected":[97.360417,0.05467229],"passed":false},{"actual":[94.944444,0.05284575],"check":"boundary control 1","expected":[94.944444,0.05284575],"passed":true},{"actual":[97.302083,0.05468486],"check":"normal control 1","expected":[97.302083,0.05468486],"passed":true},{"actual":[91.911111,0.08638888],"check":"normal control 2","expected":[91.911111,0.08638888],"passed":true},{"actual":[97.78875,0.04509869],"check":"normal control 3","expected":[97.78875,0.04509869],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression short bill yield denominator 1\", \"actual\": [98.736111, 0.02503086], \"expected\": [98.736111, 0.02567168], \"passed\": false}, {\"check\": \"regression short bill yield denominator 2\", \"actual\": [99.974722, 0.00101363], \"expected\": [99.974722, 0.00101415], \"passed\": false}, {\"check\": \"partial repair probe 1\", \"actual\": [99.494444, 0.01008789], \"expected\": [99.494444, 0.01019041], \"passed\": false}, {\"check\": \"partial repair probe 2\", \"actual\": [97.360417, 0.05186027], \"expected\": [97.360417, 0.05467229], \"passed\": false}, {\"check\": \"boundary control 1\", \"actual\": [94.944444, 0.05284575], \"expected\": [94.944444, 0.05284575], \"passed\": true}, {\"check\": \"normal control 1\", \"actual\": [97.302083, 0.05468486], \"expected\": [97.302083, 0.05468486], \"passed\": true}, {\"check\": \"normal control 2\", \"actual\": [91.911111, 0.08638888], \"expected\": [91.911111, 0.08638888], \"passed\": true}, {\"check\": \"normal control 3\", \"actual\": [97.78875, 0.04509869], \"expected\": [97.78875, 0.04509869], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":48.188,"exit_code":1,"observations":[{"actual":[98.736111,0.02534722],"check":"regression short bill yield denominator 1","expected":[98.736111,0.02567168],"passed":false},{"actual":[99.974722,0.00101389],"check":"regression short bill yield denominator 2","expected":[99.974722,0.00101415],"passed":false},{"actual":[99.494444,0.01013889],"check":"partial repair probe 1","expected":[99.494444,0.01019041],"passed":false},{"actual":[97.360417,0.05322917],"check":"partial repair probe 2","expected":[97.360417,0.05467229],"passed":false},{"actual":[94.944444,0.05284575],"check":"boundary control 1","expected":[94.944444,0.05284575],"passed":true},{"actual":[97.302083,0.05468486],"check":"normal control 1","expected":[97.302083,0.05468486],"passed":true},{"actual":[91.911111,0.08638888],"check":"normal control 2","expected":[91.911111,0.08638888],"passed":true},{"actual":[97.78875,0.04509869],"check":"normal control 3","expected":[97.78875,0.04509869],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression short bill yield denominator 1\", \"actual\": [98.736111, 0.02534722], \"expected\": [98.736111, 0.02567168], \"passed\": false}, {\"check\": \"regression short bill yield denominator 2\", \"actual\": [99.974722, 0.00101389], \"expected\": [99.974722, 0.00101415], \"passed\": false}, {\"check\": \"partial repair probe 1\", \"actual\": [99.494444, 0.01013889], \"expected\": [99.494444, 0.01019041], \"passed\": false}, {\"check\": \"partial repair probe 2\", \"actual\": [97.360417, 0.05322917], \"expected\": [97.360417, 0.05467229], 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