Closed jgarces02 closed 4 years ago
Hi,
can you perhaps make this problem reproducible by posting the complete data and code? Or some subset of the data that illustrates the problem? If the data is rather large, you can put dput(mydata)
on pastebin, for example.
My guess is that there were multiple optimal cutpoints and the median was returned, if the parameter break_ties
was not changed. There's not much I can tell by the first lines of the ROC curve.
Yes, I guess that a head
is not enough, it was just in case...
structure(list(x.sorted = c(Inf, 6.315263451, 5.170684444, 4.877609364,
4.782353157, 4.474549463, 4.273921089, 4.122465156, 4.000705813,
3.854426206, 3.6928992, 3.678133407, 3.627976393, 3.581001391,
3.483279444, 3.378620952, 3.372424961, 3.269772615, 3.207061971,
3.204966446, 3.177320725, 3.163491212, 2.986489972, 2.921139063,
2.8959012, 2.867251471, 2.861370101, 2.806651647, 2.704984, 2.648089572,
2.619723224, 2.596228666, 2.544907904, 2.505740351, 2.422510092,
2.39897944, 2.3283052, 2.292259404, 2.259753031, 2.207856671,
2.179837442, 2.154146987, 2.125988864, 2.104957586, 2.104893365,
2.101455961, 2.093432707, 2.088926599, 2.078215915, 2.061478525,
2.027699662, 1.964978076, 1.934153913, 1.918243059, 1.901591361,
1.873115523, 1.859677384, 1.848990598, 1.847506402, 1.838536537,
1.802418426, 1.800451027, 1.796107849, 1.793267533, 1.790135689,
1.785559388, 1.755635745, 1.727025904, 1.703292172, 1.658919618,
1.61292873, 1.612726949, 1.59711084, 1.594956892, 1.5948724,
1.593759152, 1.573824122, 1.562346405, 1.552325413, 1.552107853,
1.549803922, 1.548718385, 1.524129314, 1.5073218, 1.502104347,
1.487163317, 1.486159001, 1.485470064, 1.459023256, 1.451937716,
1.44652186, 1.41474872, 1.401337584, 1.39363337, 1.391494495,
1.383406677, 1.382764706, 1.379917595, 1.355311495, 1.34527235,
1.344956198, 1.342642, 1.336793635, 1.333386655, 1.328632154,
1.326216393, 1.325906684, 1.325504301, 1.325049575, 1.322017723,
1.3195044, 1.313179027, 1.308044359, 1.301685884, 1.300331465,
1.277128459, 1.273090703, 1.25776591, 1.250565147, 1.246608088,
1.245354314, 1.23130497, 1.229318862, 1.223767768, 1.219780837,
1.203859157, 1.201843237, 1.178914564, 1.175472204, 1.174959781,
1.16844, 1.165591746, 1.160866361, 1.156344584, 1.155033016,
1.145289458, 1.142560783, 1.138071211, 1.125781074, 1.119211986,
1.111947865, 1.105618572, 1.102241574, 1.092799218, 1.088284451,
1.085129773, 1.0717914, 1.070167002, 1.060884, 1.0605446, 1.058145872,
1.057855315, 1.034757318, 1.026408706, 1.02531048, 1.0245624,
1.011012679, 1.007623164, 1.002940042, 0.999237837, 0.990686071,
0.9823608, 0.963732988, 0.962268926, 0.954027274, 0.950661866,
0.944094256, 0.942658, 0.931368509, 0.929468496, 0.928504441,
0.924808598, 0.912367059, 0.901732919, 0.899920212, 0.891769529,
0.886020471, 0.878704284, 0.876812113, 0.870450678, 0.869241947,
0.862239885, 0.8584866, 0.8381508, 0.832701108, 0.829326053,
0.822431373, 0.814420233, 0.811750615, 0.807409037, 0.803801644,
0.803750125, 0.795526593, 0.794179529, 0.779449567, 0.770609031,
0.768485463, 0.752808719, 0.747698906, 0.742881311, 0.742482168,
0.73826484, 0.734165922, 0.733195257, 0.732633129, 0.725428651,
0.724738138, 0.723802111, 0.723130112, 0.718790368, 0.7161632,
0.710050411, 0.7062392, 0.704181066, 0.704082, 0.702871754, 0.7007556,
0.698108232, 0.69397588, 0.68813539, 0.684843769, 0.681886429,
0.674630066, 0.668878433, 0.668379918, 0.667625951, 0.665277422,
0.659985407, 0.655709318, 0.6529344, 0.650411915, 0.649132663,
0.647367744, 0.644018957, 0.635013993, 0.633368676, 0.631073772,
0.613420732, 0.612176864, 0.611610606, 0.609460615, 0.598011813,
0.5937282, 0.591944154, 0.587068247, 0.58525636, 0.582862, 0.581956274,
0.5815292, 0.581022, 0.579939592, 0.572809377, 0.568451752, 0.562399593,
0.562061794, 0.55372792, 0.548372329, 0.547819268, 0.5473626,
0.542116277, 0.541948911, 0.541266664, 0.541192825, 0.5386198,
0.534743996, 0.5339088, 0.516795058, 0.515100223, 0.513132966,
0.502413793, 0.499747225, 0.493226275, 0.491471638, 0.476123212,
0.4731648, 0.472882577, 0.471947895, 0.470937878, 0.466512122,
0.465773157, 0.460947442, 0.451086781, 0.45105227, 0.444123224,
0.441478162, 0.44088182, 0.435961112, 0.435397578, 0.434402963,
0.431761624, 0.42584029, 0.4217052, 0.414179788, 0.401326243,
0.399400772, 0.395851057, 0.392769529, 0.3895648, 0.381949202,
0.381422825, 0.381258652, 0.378531996, 0.376691741, 0.374340167,
0.372506453, 0.371187164, 0.368529428, 0.366833566, 0.365212098,
0.361758829, 0.360472717, 0.358903239, 0.343563485, 0.341633632,
0.339604278, 0.338816804, 0.338709576, 0.329576961, 0.329036654,
0.324155192, 0.32112164, 0.31896413, 0.314625386, 0.312928, 0.309803155,
0.306768374, 0.303039145, 0.296370629, 0.290155111, 0.2900744,
0.28833279, 0.283764932, 0.282674387, 0.282649612, 0.279056764,
0.269359646, 0.256732633, 0.249303806, 0.24194598, 0.241791152,
0.240749772, 0.239731921, 0.232869349, 0.22439472, 0.217397289,
0.212104694, 0.209388233, 0.209163874, 0.204238777, 0.203882044,
0.201730616, 0.193840766, 0.19032, 0.1888292, 0.187437048, 0.184875782,
0.180033433, 0.171027241, 0.164005362, 0.154581098, 0.153733804,
0.1384584, 0.13667467, 0.1176252, 0.113781, 0.09824986, 0.088172507,
0.078665313, 0.077467691, 0.075028396, 0.056924362, 0.052317956,
0.0502272, 0.037646946, 0.020823606, 0.009356919, 0.0083304,
0.00645039, 0), tp = c(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
43, 44, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130,
131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156,
157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
169, 170, 171, 172, 173, 174, 175, 176, 176, 177, 178, 179, 180,
181, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204,
205, 205, 206, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215,
216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228,
229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 240,
241, 241, 242, 243, 243, 244, 245, 246, 246, 247, 248, 249, 250,
251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263,
263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 272, 273, 274,
275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287,
288, 289, 290, 291, 292, 292, 293, 294, 295, 296, 297, 297, 298,
299, 300, 301, 302, 303, 304, 305, 306, 307, 307, 308, 309, 310,
311, 312, 313, 314, 315, 316, 316, 317, 318, 319, 320, 321, 322,
323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 333, 333,
334, 335, 336, 337, 338, 339, 339, 340, 341, 341, 341, 342, 343,
343, 343, 344, 345, 345, 346, 346, 347, 348, 348, 349, 349),
fp = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 9, 9, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18,
18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
18, 19, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 22, 23, 23,
23, 24, 25, 25, 25, 26, 26, 27, 27, 27, 28, 28, 29), tn = c(29L,
29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L, 29L,
29L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L,
28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L,
28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 28L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L, 27L,
27L, 27L, 27L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 26L, 25L,
25L, 25L, 25L, 25L, 25L, 24L, 24L, 24L, 24L, 24L, 24L, 24L,
24L, 24L, 24L, 24L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L,
23L, 23L, 23L, 23L, 23L, 23L, 23L, 22L, 22L, 21L, 21L, 21L,
21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L,
21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L,
21L, 21L, 21L, 21L, 21L, 21L, 21L, 21L, 20L, 20L, 19L, 19L,
19L, 18L, 18L, 18L, 18L, 17L, 17L, 17L, 17L, 17L, 17L, 17L,
17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 17L, 16L,
16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 16L, 15L, 15L, 15L,
15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L, 15L,
15L, 15L, 15L, 15L, 15L, 15L, 14L, 14L, 14L, 14L, 14L, 14L,
13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 13L, 12L,
12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 12L, 11L, 11L, 11L,
11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L, 11L,
11L, 11L, 11L, 10L, 9L, 9L, 9L, 9L, 9L, 9L, 9L, 8L, 8L, 8L,
7L, 6L, 6L, 6L, 5L, 4L, 4L, 4L, 3L, 3L, 2L, 2L, 2L, 1L, 1L,
0L), fn = c(349L, 348L, 347L, 346L, 345L, 344L, 343L, 342L,
341L, 340L, 339L, 338L, 337L, 336L, 336L, 335L, 334L, 333L,
332L, 331L, 330L, 329L, 328L, 327L, 326L, 325L, 324L, 323L,
322L, 321L, 320L, 319L, 318L, 317L, 316L, 315L, 314L, 313L,
312L, 311L, 310L, 309L, 308L, 307L, 306L, 305L, 305L, 304L,
303L, 302L, 301L, 300L, 299L, 298L, 297L, 296L, 295L, 294L,
293L, 292L, 291L, 290L, 289L, 288L, 287L, 286L, 285L, 284L,
283L, 282L, 281L, 280L, 279L, 278L, 277L, 276L, 275L, 274L,
273L, 272L, 271L, 270L, 269L, 268L, 267L, 266L, 265L, 264L,
263L, 262L, 261L, 260L, 259L, 258L, 257L, 256L, 255L, 254L,
253L, 252L, 251L, 250L, 249L, 248L, 247L, 246L, 245L, 244L,
243L, 242L, 241L, 240L, 239L, 238L, 237L, 236L, 235L, 234L,
233L, 232L, 231L, 230L, 229L, 228L, 227L, 226L, 225L, 224L,
223L, 222L, 221L, 220L, 219L, 218L, 217L, 216L, 215L, 214L,
213L, 212L, 211L, 210L, 209L, 208L, 207L, 206L, 205L, 204L,
203L, 202L, 201L, 200L, 199L, 198L, 197L, 196L, 195L, 194L,
193L, 192L, 191L, 190L, 189L, 188L, 187L, 186L, 185L, 184L,
183L, 182L, 181L, 180L, 180L, 179L, 178L, 177L, 176L, 175L,
174L, 173L, 173L, 172L, 171L, 170L, 169L, 168L, 168L, 167L,
166L, 165L, 164L, 163L, 162L, 161L, 160L, 159L, 158L, 158L,
157L, 156L, 155L, 154L, 153L, 152L, 151L, 150L, 149L, 148L,
147L, 146L, 145L, 144L, 144L, 143L, 143L, 142L, 141L, 140L,
139L, 138L, 137L, 136L, 135L, 134L, 133L, 132L, 131L, 130L,
129L, 128L, 127L, 126L, 125L, 124L, 123L, 122L, 121L, 120L,
119L, 118L, 117L, 116L, 115L, 114L, 113L, 112L, 111L, 110L,
109L, 109L, 108L, 108L, 107L, 106L, 106L, 105L, 104L, 103L,
103L, 102L, 101L, 100L, 99L, 98L, 97L, 96L, 95L, 94L, 93L,
92L, 91L, 90L, 89L, 88L, 87L, 86L, 86L, 85L, 84L, 83L, 82L,
81L, 80L, 79L, 78L, 77L, 77L, 76L, 75L, 74L, 73L, 72L, 71L,
70L, 69L, 68L, 67L, 66L, 65L, 64L, 63L, 62L, 61L, 60L, 59L,
58L, 57L, 57L, 56L, 55L, 54L, 53L, 52L, 52L, 51L, 50L, 49L,
48L, 47L, 46L, 45L, 44L, 43L, 42L, 42L, 41L, 40L, 39L, 38L,
37L, 36L, 35L, 34L, 33L, 33L, 32L, 31L, 30L, 29L, 28L, 27L,
26L, 25L, 24L, 23L, 22L, 21L, 20L, 19L, 18L, 17L, 16L, 16L,
16L, 15L, 14L, 13L, 12L, 11L, 10L, 10L, 9L, 8L, 8L, 8L, 7L,
6L, 6L, 6L, 5L, 4L, 4L, 3L, 3L, 2L, 1L, 1L, 0L, 0L), tpr = c(0,
0.00286532951289398, 0.00573065902578797, 0.00859598853868195,
0.0114613180515759, 0.0143266475644699, 0.0171919770773639,
0.0200573065902579, 0.0229226361031519, 0.0257879656160458,
0.0286532951289398, 0.0315186246418338, 0.0343839541547278,
0.0372492836676218, 0.0372492836676218, 0.0401146131805158,
0.0429799426934097, 0.0458452722063037, 0.0487106017191977,
0.0515759312320917, 0.0544412607449857, 0.0573065902578797,
0.0601719197707736, 0.0630372492836676, 0.0659025787965616,
0.0687679083094556, 0.0716332378223496, 0.0744985673352436,
0.0773638968481375, 0.0802292263610315, 0.0830945558739255,
0.0859598853868195, 0.0888252148997135, 0.0916905444126074,
0.0945558739255014, 0.0974212034383954, 0.100286532951289,
0.103151862464183, 0.106017191977077, 0.108882521489971,
0.111747851002865, 0.114613180515759, 0.117478510028653,
0.120343839541547, 0.123209169054441, 0.126074498567335,
0.126074498567335, 0.128939828080229, 0.131805157593123,
0.134670487106017, 0.137535816618911, 0.140401146131805,
0.143266475644699, 0.146131805157593, 0.148997134670487,
0.151862464183381, 0.154727793696275, 0.157593123209169,
0.160458452722063, 0.163323782234957, 0.166189111747851,
0.169054441260745, 0.171919770773639, 0.174785100286533,
0.177650429799427, 0.180515759312321, 0.183381088825215,
0.186246418338109, 0.189111747851003, 0.191977077363897,
0.194842406876791, 0.197707736389685, 0.200573065902579,
0.203438395415473, 0.206303724928367, 0.209169054441261,
0.212034383954155, 0.214899713467049, 0.217765042979943,
0.220630372492837, 0.223495702005731, 0.226361031518625,
0.229226361031519, 0.232091690544413, 0.234957020057307,
0.237822349570201, 0.240687679083095, 0.243553008595989,
0.246418338108883, 0.249283667621777, 0.25214899713467, 0.255014326647564,
0.257879656160458, 0.260744985673352, 0.263610315186246,
0.26647564469914, 0.269340974212034, 0.272206303724928, 0.275071633237822,
0.277936962750716, 0.28080229226361, 0.283667621776504, 0.286532951289398,
0.289398280802292, 0.292263610315186, 0.29512893982808, 0.297994269340974,
0.300859598853868, 0.303724928366762, 0.306590257879656,
0.30945558739255, 0.312320916905444, 0.315186246418338, 0.318051575931232,
0.320916905444126, 0.32378223495702, 0.326647564469914, 0.329512893982808,
0.332378223495702, 0.335243553008596, 0.33810888252149, 0.340974212034384,
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1.0603695287027, 1.06323485821559, 1.06610018772849, 1.0316174291078,
1.03448275862069, 1)), row.names = c(NA, -379L), class = c("roc_cutpointr",
"tbl_df", "tbl", "data.frame"))
I tried run cutpointr
without bootstraping and it seems that, in that case, manual and R results are the same. So there's the reason why this question was a bit useless, sorry for wasting your time and thanks a lot for your help!
OK, so you ran method = maximize_boot_metric
before? Or did you now just set boot_runs = 0
?
No, I run in the "classical" way: cutpointr(data = mydata, x = myvar, class = myclass, na.rm = T)
... running it with method = maximize_boot_metric
would also solve this problem?
So you ran it either with boot_runs = 0
and with, for example, boot_runs = 500
and it returned different optimal cutpoints? If so, can you post mydata
instead of the ROC curve? If it's very long, you can put it on pastebin.
Yes, cutoffs for both tries are slightly different...
I didn't know pastebin very useful! Here you have mydata
: https://pastebin.com/pBMu9zQR
Thanks for posting the data. I tried running cutpointr
with and without bootstrapping. The results are (as they should be) the same. Also extracting the optimal value from the ROC curve returns the same cutpoint. Do you get differing cutpoints running this code? I used as.data.frame
when extracting rows from the ROC curve to avoid the automatic rounding by tibble
. Maybe that caused the discrepancy?
library(cutpointr)
library(tidyverse)
(cp1 <- cutpointr(dat, myvar, myclass, na.rm = T, metric = sum_sens_spec))
#> Assuming the positive class is 0
#> Assuming the positive class has higher x values
#> # A tibble: 1 x 16
#> direction optimal_cutpoint method sum_sens_spec acc sensitivity
#> <chr> <dbl> <chr> <dbl> <dbl> <dbl>
#> 1 >= 0.0990444 maximize_metric 1.35766 0.671498 0.670157
#> specificity AUC pos_class neg_class prevalence outcome predictor
#> <dbl> <dbl> <fct> <fct> <dbl> <chr> <chr>
#> 1 0.6875 0.682714 0 1 0.922705 myclass myvar
#> data roc_curve boot
#> <list> <list> <lgl>
#> 1 <tibble [414 x 2]> <tibble [405 x 10]> NA
(cp2 <- cutpointr(dat, myvar, myclass, na.rm = T, metric = sum_sens_spec, boot_runs = 10))
#> Assuming the positive class is 0
#> Assuming the positive class has higher x values
#> Running bootstrap...
#> # A tibble: 1 x 16
#> direction optimal_cutpoint method sum_sens_spec acc sensitivity
#> <chr> <dbl> <chr> <dbl> <dbl> <dbl>
#> 1 >= 0.0990444 maximize_metric 1.35766 0.671498 0.670157
#> specificity AUC pos_class neg_class prevalence outcome predictor
#> <dbl> <dbl> <fct> <fct> <dbl> <chr> <chr>
#> 1 0.6875 0.682714 0 1 0.922705 myclass myvar
#> data roc_curve boot
#> <list> <list> <list>
#> 1 <tibble [414 x 2]> <tibble [405 x 10]> <tibble [10 x 23]>
cp1 %>%
select(roc_curve) %>%
unnest(cols = "roc_curve") %>%
slice(which.max(m)) %>%
as.data.frame
#> x.sorted tp fp tn fn tpr tnr fpr fnr m
#> 1 0.09904436 256 10 22 126 0.6701571 0.6875 0.3125 0.3298429 1.357657
cp2 %>%
select(roc_curve) %>%
unnest(cols = "roc_curve") %>%
slice(which.max(m)) %>%
as.data.frame
#> x.sorted tp fp tn fn tpr tnr fpr fnr m
#> 1 0.09904436 256 10 22 126 0.6701571 0.6875 0.3125 0.3298429 1.357657
Created on 2020-07-13 by the reprex package (v0.3.0)
That's a mystery... I ran this code:
> ct0 <- cutpointr(data = mydata, x = myvar, class = myclass, na.rm = T, method = maximize_boot_metric, boot_stratify = T, boot_runs = 0)
> ct0
# A tibble: 1 x 16
direction optimal_cutpoint method sum_sens_spec acc sensitivity specificity AUC pos_class neg_class
<chr> <dbl> <chr> <dbl> <dbl> <dbl> <dbl> <dbl> <fct> <fct>
1 >= 0.0820404 maximize_boot_metric 1.31888 0.714976 0.725131 0.59375 0.682714 0 1
prevalence outcome predictor data roc_curve boot
<dbl> <chr> <chr> <list> <list> <lgl>
1 0.922705 myclass myvar <tibble [414 x 2]> <tibble [405 x 9]> NA
> ct500 <- cutpointr(data = mydata, x = myvar, class = myclass, na.rm = T, method = maximize_boot_metric, boot_stratify = T, boot_runs = 500)
> ct500
# A tibble: 1 x 16
direction optimal_cutpoint method sum_sens_spec acc sensitivity specificity AUC pos_class neg_class
<chr> <dbl> <chr> <dbl> <dbl> <dbl> <dbl> <dbl> <fct> <fct>
1 >= 0.0823939 maximize_boot_metric 1.31888 0.714976 0.725131 0.59375 0.682714 0 1
prevalence outcome predictor data roc_curve boot
<dbl> <chr> <chr> <list> <list> <list>
1 0.922705 myclass myvar <tibble [414 x 2]> <tibble [405 x 9]> <tibble [500 x 23]>
And these are different :cry:
Well, here you're using maximize_boot_metric
, which bootstraps the cutpoint estimation, then you're running an outer bootstrapping which estimates the metrics after bootstrapping the optimal cutpoint (see the "bootstrapped cutpoints" chapter in the vignette for details).
If you set a seed before each cutpointr
call using set.seed(123), the optimal cutpoints should be identical. They might of course differ from the optimal cutpoint extracted from the ROC curve.
Perfect. Yes, indeed, with set.seed()
all seems to work nicely. Thanks a lot for your help (and patience)!
You're welcome, that's good to hear. It's always helpful to see what users are struggling with.
Hi (again ::sweat::) @Thie1e,
I've a (possibly silly) question, if you don't mind, please. I ran
cutpointr(..., metric = sum_sens_spec)
and I don't understand how it calculates this cutoff because, when I do it manually my results, are a bit different.Over the
ct$roc_curve
I have added a new col (ss
) withsens + spec
calculation (just for test what I'm saying)...... and the
x.sorted
with higher value is distinct the one calculated bycutpointr
. What I'm missing, please?