search for: withney

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2010 Aug 20
2
U value from wilcox.test
...e p-value. Is W value correspond to U value ? >From the help I understand that W=U+m*(m+1)/2, is this true ? In the case it is, my U values would be U=W-6=-6!! I thought that a U value could not be neagtive. I would be happy to have any information about how to obtain the U value from the Mann-Withney test (wilcox.test()) in order to be able to compare it with table of critical U value commonly found. Thanks a lot for your time and help Have a nice day, Chlo? -- View this message in context: http://r.789695.n4.nabble.com/U-value-from-wilcox-test-tp2332811p2332811.html Sent from the R help mai...
2015 May 15
6
[LLVMdev] Proposal: change LNT’s regression detection algorithm and how it is used to reduce false positives
tl;dr in low data situations we don’t look at past information, and that increases the false positive regression rate. We should look at the possibly incorrect recent past runs to fix that. Motivation: LNT’s current regression detection system has false positive rate that is too high to make it useful. With test suites as large as the llvm “test-suite” a single report will show hundreds of
2015 May 18
2
[LLVMdev] Proposal: change LNT’s regression detection algorithm and how it is used to reduce false positives
...ind out what the noise > levels are per program across a Cortex-A53, a Cortex-A57 and a Core i7 CPU. In > attachment is an example of a chart for just one program, indicating that the noise level is > sometimes dependent on the micro-architecture of the core it runs on. Whereas a > Mann-Withney U - or similar - test would probably find - given enough data > points - what should be considered noise and what not; there may be a way to > run the test-suite in benchmark mode many times when a board gets set up, and analyse > the results of that. The idea is that this way, the noisine...