CDF for Tracy-Widom (TW1) Distribution 1.0 |
Date Added: September 03, 2013 | Visits: 605 |
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The attached CSV file contains a 751 x 2 matrix, which can be read using the MATLAB "csvread" command.>>data = csvread('TW1.csv');The first column is the standardized test statistic Z, ranging from -3.9 to 3.6 in increments of 0.01. The second column is the cumulative distribution function (CDF). The CDF has been truncated, e.g. set to 0 at -3.9 and 1 at 3.6 to bound the distribution. To use this CDF for interpolating outside the -3.89 to 3.59 range, consider replacing -3.9 with -Inf and 3.60 with +Inf.For using this distribution to test for the number of significant principal components, see: Patterson N, Price AL, Reich D, 2006 Population Structure and Eigenanalysis. PLoS Genet 2(12): e190. doi:10.1371/journal.pgen.0020190The source data is taken, with the author's permission, from the thesis of Andrei Bejan, who performed these calculations: for further details see: http://www.cl.cam.ac.uk/~aib29/MScdssrtnWrwck.pdfCorrections were made to the source data to fix obvious data entry errors and, using local gradients (1st and 2nd derivatives), to give a smooth PDF as well as CDF. The original data tables and the adjustments are documented in the attached TW1.xls Microsoft Excel spreadsheet.Note: The CSV file uses the corrected data
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License: Shareware | Size: 102.4 KB |
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