Hi Rupert, The M-values refer to the moments <https://en.wikipedia.org/wiki/Moment_(mathematics)> of the distribution. The first moment (mean <https://en.wikipedia.org/wiki/Mean>) and the second moment (variance <https://en.wikipedia.org/wiki/Variance>) can be used to compute the standard deviation, as Patrick described. Hope this helps!
Sincerely, T.J. Thomas J. Corona, Ph.D. Kitware, Inc. Senior R&D Engineer 21 Corporate Drive Clifton Park, NY 12065-8662 Phone: 518-881-4443 > On Apr 29, 2017, at 3:40 PM, Patrick O'Leary <patrick.ole...@kitware.com> > wrote: > > standard deviation = sqrt(M2 - M1^2) where M1 is the mean. > > I hope this helps. > Patrick > > On Sat, Apr 29, 2017 at 12:18 PM Rupert Gladstone > <rupertgladstone1...@gmail.com <mailto:rupertgladstone1...@gmail.com>> wrote: > 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. > > 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: > http://www.paraview.org/Wiki/Statistical_analysis > <http://www.paraview.org/Wiki/Statistical_analysis> > > 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). > > Can anyone help with either my lack of standard deviation or an alternative > way to calculate a correlation coefficient? > > Thanks, > Rupert Gladstone > _______________________________________________ > Powered by www.kitware.com <http://www.kitware.com/> > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > <http://www.kitware.com/opensource/opensource.html> > > Please keep messages on-topic and check the ParaView Wiki at: > http://paraview.org/Wiki/ParaView <http://paraview.org/Wiki/ParaView> > > Search the list archives at: http://markmail.org/search/?q=ParaView > <http://markmail.org/search/?q=ParaView> > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/paraview > <http://public.kitware.com/mailman/listinfo/paraview> > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Please keep messages on-topic and check the ParaView Wiki at: > http://paraview.org/Wiki/ParaView > > Search the list archives at: http://markmail.org/search/?q=ParaView > > Follow this link to subscribe/unsubscribe: > http://public.kitware.com/mailman/listinfo/paraview
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Search the list archives at: http://markmail.org/search/?q=ParaView Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/paraview
