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1 /* | 1 /* |
2 * Copyright (C) 2007 Apple Inc. All rights reserved. | 2 * Copyright (C) 2007 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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233 function tDist(n) | 233 function tDist(n) |
234 { | 234 { |
235 if (n > tMax) | 235 if (n > tMax) |
236 return tLimit; | 236 return tLimit; |
237 return tDistribution[n]; | 237 return tDistribution[n]; |
238 } | 238 } |
239 | 239 |
240 | 240 |
241 function formatMean(meanWidth, mean, stdErr, count) | 241 function formatMean(meanWidth, mean, stdErr, count) |
242 { | 242 { |
| 243 if (mean != mean) { |
| 244 var result = " ERROR "; |
| 245 for (var i = 0; i < meanWidth; ++i) |
| 246 result = " " + result; |
| 247 return result; |
| 248 } |
| 249 |
243 var meanString = mean.toFixed(1).toString(); | 250 var meanString = mean.toFixed(1).toString(); |
244 while (meanString.length < meanWidth) { | 251 while (meanString.length < meanWidth) { |
245 meanString = " " + meanString; | 252 meanString = " " + meanString; |
246 } | 253 } |
247 | 254 |
248 var error = "+/- " + ((tDist(count) * stdErr / mean) * 100).toFixed(1) +
"% "; | 255 var errString = ((tDist(count) * stdErr / mean) * 100).toFixed(1) + "%"; |
| 256 while (errString.length < "99.9%".length) |
| 257 errString += " "; |
| 258 |
| 259 var error = "+/- " + errString + " "; |
249 | 260 |
250 return meanString + "ms " + error; | 261 return meanString + "ms " + error; |
251 } | 262 } |
252 | 263 |
253 function computeLabelWidth() | 264 function computeLabelWidth() |
254 { | 265 { |
255 var width = "Total".length; | 266 var width = "Total".length; |
256 for (var category in categoryMeans1) { | 267 for (var category in categoryMeans1) { |
257 if (category.length + 2 > width) | 268 if (category.length + 2 > width) |
258 width = category.length + 2; | 269 width = category.length + 2; |
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290 } | 301 } |
291 return str; | 302 return str; |
292 } | 303 } |
293 | 304 |
294 function resultLine(labelWidth, indent, label, meanWidth1, mean1, stdErr1, m
eanWidth2, mean2, stdErr2) | 305 function resultLine(labelWidth, indent, label, meanWidth1, mean1, stdErr1, m
eanWidth2, mean2, stdErr2) |
295 { | 306 { |
296 result = pad("", indent); | 307 result = pad("", indent); |
297 result += label + ": "; | 308 result += label + ": "; |
298 result = pad(result, labelWidth + 2); | 309 result = pad(result, labelWidth + 2); |
299 | 310 |
300 var t = (mean1 - mean2) / (Math.sqrt((stdErr1 * stdErr1) + (stdErr1 * st
dErr2))); | |
301 var df = count1 + count2 - 2; | |
302 | |
303 var statisticallySignificant = (Math.abs(t) > tDist(df+1)); | |
304 var diff = mean2 - mean1; | |
305 var percentage = 100 * diff / mean1; | |
306 var isFaster = diff < 0; | |
307 var probablySame = (percentage < 0.1) && !statisticallySignificant; | |
308 var ratio = isFaster ? (mean1 / mean2) : (mean2 / mean1); | |
309 var fixedRatio = (ratio < 1.2) ? ratio.toFixed(3).toString() : ((ratio <
10) ? ratio.toFixed(2).toString() : ratio.toFixed(1).toString()); | |
310 var formattedRatio = isFaster ? fixedRatio + "x as fast" : "*" + fixedRa
tio + "x as slow*"; | |
311 | |
312 var diffSummary; | 311 var diffSummary; |
313 var diffDetail; | 312 var diffDetail; |
314 | 313 |
315 if (probablySame) { | 314 if (mean1 != mean1 || mean2 != mean2) { |
316 diffSummary = "-"; | |
317 diffDetail = ""; | |
318 } else if (!statisticallySignificant) { | |
319 diffSummary = "??"; | 315 diffSummary = "??"; |
320 diffDetail = " not conclusive: might be " + formattedRatio; | 316 diffDetail = " invalid runs detected"; |
321 } else { | 317 } else { |
322 diffSummary = formattedRatio; | 318 var t = (mean1 - mean2) / (Math.sqrt((stdErr1 * stdErr1) + (stdErr2
* stdErr2))); |
323 diffDetail = " significant"; | 319 var df = count1 + count2 - 2; |
| 320 |
| 321 var statisticallySignificant = (Math.abs(t) > tDist(df+1)); |
| 322 var diff = mean2 - mean1; |
| 323 var percentage = 100 * diff / mean1; |
| 324 var isFaster = diff < 0; |
| 325 var probablySame = (percentage < 0.1) && !statisticallySignificant; |
| 326 var ratio = isFaster ? (mean1 / mean2) : (mean2 / mean1); |
| 327 var fixedRatio = (ratio < 1.2) ? ratio.toFixed(3).toString() : ((rat
io < 10) ? ratio.toFixed(2).toString() : ratio.toFixed(1).toString()); |
| 328 var formattedRatio = isFaster ? fixedRatio + "x as fast" : "*" + fix
edRatio + "x as slow*"; |
| 329 |
| 330 if (probablySame) { |
| 331 diffSummary = "-"; |
| 332 diffDetail = ""; |
| 333 } else if (!statisticallySignificant) { |
| 334 diffSummary = "??"; |
| 335 diffDetail = " not conclusive: might be " + formattedRatio; |
| 336 } else { |
| 337 diffSummary = formattedRatio; |
| 338 diffDetail = " significant"; |
| 339 } |
324 } | 340 } |
325 | 341 |
326 return result + pad(diffSummary, 18) + formatMean(meanWidth1, mean1, std
Err1, count1) + " " + formatMean(meanWidth2, mean2, stdErr2, count2) + diffDeta
il; | 342 return result + pad(diffSummary, 18) + formatMean(meanWidth1, mean1, std
Err1, count1) + " " + formatMean(meanWidth2, mean2, stdErr2, count2) + diffDeta
il; |
327 } | 343 } |
328 | 344 |
329 function printOutput() | 345 function printOutput() |
330 { | 346 { |
331 var labelWidth = computeLabelWidth(); | 347 var labelWidth = computeLabelWidth(); |
332 var meanWidth1 = computeMeanWidth(mean1, categoryMeans1, testMeansByCate
gory1); | 348 var meanWidth1 = computeMeanWidth(mean1, categoryMeans1, testMeansByCate
gory1); |
333 var meanWidth2 = computeMeanWidth(mean2, categoryMeans2, testMeansByCate
gory2); | 349 var meanWidth2 = computeMeanWidth(mean2, categoryMeans2, testMeansByCate
gory2); |
334 | 350 |
335 print("\n"); | 351 print("\n"); |
336 var header = "TEST"; | 352 var header = "TEST"; |
337 while (header.length < labelWidth) | 353 while (header.length < labelWidth) |
338 header += " "; | 354 header += " "; |
339 header += " COMPARISON FROM TO D
ETAILS"; | 355 header += " COMPARISON FROM TO
DETAILS"; |
340 print(header); | 356 print(header); |
341 print(""); | 357 print(""); |
342 print("=================================================================
============"); | 358 print("=================================================================
=============="); |
343 print(""); | 359 print(""); |
344 print(resultLine(labelWidth, 0, "** TOTAL **", meanWidth1, mean1, stdErr
1, meanWidth2, mean2, stdErr2)); | 360 print(resultLine(labelWidth, 0, "** TOTAL **", meanWidth1, mean1, stdErr
1, meanWidth2, mean2, stdErr2)); |
345 print(""); | 361 print(""); |
346 print("=================================================================
============"); | 362 print("=================================================================
=============="); |
347 | 363 |
348 for (var category in categoryMeans1) { | 364 for (var category in categoryMeans1) { |
349 print(""); | 365 print(""); |
350 print(resultLine(labelWidth, 2, category, | 366 print(resultLine(labelWidth, 2, category, |
351 meanWidth1, categoryMeans1[category], categoryStdEr
rs1[category], | 367 meanWidth1, categoryMeans1[category], categoryStdEr
rs1[category], |
352 meanWidth2, categoryMeans2[category], categoryStdEr
rs2[category])); | 368 meanWidth2, categoryMeans2[category], categoryStdEr
rs2[category])); |
353 for (var test in testMeansByCategory1[category]) { | 369 for (var test in testMeansByCategory1[category]) { |
354 var shortName = test.replace(/^[^-]*-/, ""); | 370 var shortName = test.replace(/^[^-]*-/, ""); |
355 print(resultLine(labelWidth, 4, shortName, | 371 print(resultLine(labelWidth, 4, shortName, |
356 meanWidth1, testMeansByCategory1[category][test
], testStdErrsByCategory1[category][test], | 372 meanWidth1, testMeansByCategory1[category][test
], testStdErrsByCategory1[category][test], |
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371 mean2 = computeMeans(count2, total2, categoryTotals2, categoryMeans2, testTo
talsByCategory2, testMeansByCategory2); | 387 mean2 = computeMeans(count2, total2, categoryTotals2, categoryMeans2, testTo
talsByCategory2, testMeansByCategory2); |
372 | 388 |
373 stdDev1 = computeStdDevs(mean1, itemTotals1, categoryStdDevs1, categoryMeans
1, testStdDevsByCategory1, testMeansByCategory1); | 389 stdDev1 = computeStdDevs(mean1, itemTotals1, categoryStdDevs1, categoryMeans
1, testStdDevsByCategory1, testMeansByCategory1); |
374 stdDev2 = computeStdDevs(mean2, itemTotals2, categoryStdDevs2, categoryMeans
2, testStdDevsByCategory2, testMeansByCategory2); | 390 stdDev2 = computeStdDevs(mean2, itemTotals2, categoryStdDevs2, categoryMeans
2, testStdDevsByCategory2, testMeansByCategory2); |
375 | 391 |
376 stdErr1 = computeStdErrors(count1, stdDev1, categoryStdErrs1, categoryStdDev
s1, testStdErrsByCategory1, testStdDevsByCategory1); | 392 stdErr1 = computeStdErrors(count1, stdDev1, categoryStdErrs1, categoryStdDev
s1, testStdErrsByCategory1, testStdDevsByCategory1); |
377 stdErr2 = computeStdErrors(count2, stdDev2, categoryStdErrs2, categoryStdDev
s2, testStdErrsByCategory2, testStdDevsByCategory2); | 393 stdErr2 = computeStdErrors(count2, stdDev2, categoryStdErrs2, categoryStdDev
s2, testStdErrsByCategory2, testStdDevsByCategory2); |
378 | 394 |
379 printOutput(); | 395 printOutput(); |
380 } | 396 } |
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