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HYPHY Package >> HyPhy feedback >> Latin Hypercube Sampling question http://www.hyphy.org/cgi-bin/hyphy_forums/YaBB.pl?num=1377773088 Message started by rss on Aug 29th, 2013 at 3:44am |
Title: Latin Hypercube Sampling question Post by rss on Aug 29th, 2013 at 3:44am
I'm trying to perform parameter resampling using Latin Hypercube sampling in HYPHY, and had a couple of questions:
1) Is it possible to perform LHS from the command line in HYPHY? 2) After resampling, it looks like some of my LHS samples have a likelihood value of -infinity. I thought that the re-samples are chosen with probability somehow proportional to their likelihood, so that impossible parameter combinations would be excluded? Any idea why some of the re-samples might have a likelihood value of -infinity? (I chose M << N, so there should have been plenty of initial samples to choose from. 3)Is it correct to turn LHS samples into confidence bounds by taking the interval containing 95% of the resampled parameter estimates? Thanks!! |
Title: Re: Latin Hypercube Sampling question Post by Sergei on Aug 29th, 2013 at 8:11am
Hi rss,
1). Yes, you can perform such an analysis. Assuming you have a NEXUS file containing the HyPhy block. [To export such a file assuming you have a likelihood function lfID (or any other name defined), just use [code] Export (lfNEXUS, lfID); fprintf (file_to_save_to, CLEAR_FILE, lfNEXUS); [/code] ] To do so call $HYPHYMP -p nexus_with_lf_data Using the '-p' flag will prompt HyPhy to offer you a list of post-processing options, including LHC 2). This is definitely NOT normal (could be a bug, or something wonky with the likelihood function). -Infinity basically means that the likelihood of your data is exactly 0, which should not happen. Can you send me an example? 3). That is the idea, yes. Sergei |
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