Thread: [pdl-stats] PDL::Stats::GLM - Uninvertible matrix given to inv
Status: Beta
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maggiexyz
From: Daniel K. <dan...@gm...> - 2014-12-08 19:10:17
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I am trying to use the logistic function in PDL::Stats::GLM, but sometimes get the error "Uninvertible matrix given to inv". I have traced this to PDL::Fit::LM trying to invert a matrix to estimate covariance, and found this related post from 2009: http://mailman.jach.hawaii.edu/pipermail/perldl/2009-November/002477.html However, it seems that there's not any resolution to that post. Is there a way to work around this issue or make it not appear? For now, I've resorted to locally removing the matinv call in PDL::Fit::LM::lmfit, as the output is never used by PDL::Stats::GLM::logistic, but having a dependency on a forked module is obviously not an ideal solution. Thanks Daniel |
From: Maggie X <mag...@gm...> - 2014-12-10 13:25:57
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Hi Daniel, Can you show an example of the data that produced the uninvertible matrix? Maggie On Dec 8, 2014 2:10 PM, "Daniel Kitchener" <dan...@gm...> wrote: > I am trying to use the logistic function in PDL::Stats::GLM, but sometimes > get the error "Uninvertible matrix given to inv". I have traced this to > PDL::Fit::LM trying to invert a matrix to estimate covariance, and found > this related post from 2009: > http://mailman.jach.hawaii.edu/pipermail/perldl/2009-November/002477.html > > However, it seems that there's not any resolution to that post. Is there a > way to work around this issue or make it not appear? > > For now, I've resorted to locally removing the matinv call > in PDL::Fit::LM::lmfit, as the output is never used by > PDL::Stats::GLM::logistic, but having a dependency on a forked module is > obviously not an ideal solution. > > Thanks > Daniel > > > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > _______________________________________________ > pdl-stats-help mailing list > pdl...@li... > https://lists.sourceforge.net/lists/listinfo/pdl-stats-help > > |