<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hi Rupert,</div><div class=""><br class=""></div><div class="">The M-values refer to the <a href="https://en.wikipedia.org/wiki/Moment_(mathematics)" class="">moments</a> of the distribution. The first moment (<a href="https://en.wikipedia.org/wiki/Mean" class="">mean</a>) and the second moment (<a href="https://en.wikipedia.org/wiki/Variance" class="">variance</a>) can be used to compute the standard deviation, as Patrick described. Hope this helps!</div><div class=""><br class=""></div><div class="">Sincerely,</div><div class="">T.J.</div><div class=""><br class=""></div><div class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Thomas J. Corona, Ph.D.<br class="">Kitware, Inc.<br class="">Senior R&D Engineer<br class="">21 Corporate Drive<br class="">Clifton Park, NY 12065-8662<br class="">Phone: 518-881-4443</div></div>
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<br class=""><div><blockquote type="cite" class=""><div class="">On Apr 29, 2017, at 3:40 PM, Patrick O'Leary <<a href="mailto:patrick.oleary@kitware.com" class="">patrick.oleary@kitware.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">standard deviation = sqrt(M2 - M1^2) where M1 is the mean.</div><div class=""><br class=""></div><div class="">I hope this helps.</div><div class="">Patrick</div><div class=""><br class=""><div class="gmail_quote"><div class="">On Sat, Apr 29, 2017 at 12:18 PM Rupert Gladstone <<a href="mailto:rupertgladstone1972@gmail.com" class="">rupertgladstone1972@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class=""><div class=""><div class="">Hi, I'd like to calculate a correlation coefficient between two variables in a vtu data set. I am not experienced with statistics but the Pearson correlation coefficient looks suitable. So I just need the covariance and standard deviations. <br class=""><br class="">The Paraview Multicorrelative Statistics filter seems to give the covariance, but I can't find a filter that gives the standard deviation. The Descriptive Statistics filter is supposed to give standard deviation according to the documentation, but I am not getting it when I run the filter. I am referring to this documentation:<br class=""><a href="http://www.paraview.org/Wiki/Statistical_analysis" target="_blank" class="">http://www.paraview.org/Wiki/Statistical_analysis</a><br class=""><br class=""></div><div class="">I am currently running both paraview 4.0.1 and 5.0.0. They give slightly different outputs from the statistics filters, but neither gives me the standard deviation (unless it is hidden in M2, M3 or M4? I don't know what these are).<br class=""></div><div class=""><br class=""></div><div class="">Can anyone help with either my lack of standard deviation or an alternative way to calculate a correlation coefficient?<br class=""></div><div class=""><br class=""></div>Thanks,<br class=""></div>Rupert Gladstone<br class=""></div>
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