Date: Wed, 11 Oct 2006 15:00:43 +0000
Reply-To: Stats Q <statsq@hotmail.co.uk>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Stats Q <statsq@hotmail.co.uk>
Subject: Re: Model selection
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<P>Hi Marta,</P>
<P>Thanks for your e-mail. The paper says that a Log-linear model was used. From what you are saying then, I guess I've interpreted things incorrectly then i.e., log-likelihood ratio tests will be part of the output from the BIC analysis. Do you know if is the case that the lower the log-likelihood value, the better the model fits the data? And if so, how low does the value have to be to be considered low? And why would the log-likelihood value need to be reported as well as a BIC value? </P>
<P>Thanks. I appreciate the advice.<BR><BR>K S Scot </P></DIV>
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<DIV></DIV>From: <I>Marta García-Granero <biostatistics@terra.es></I><BR>Reply-To: <I>Marta García-Granero <biostatistics@terra.es></I><BR>To: <I>SPSSX-L@LISTSERV.UGA.EDU</I><BR>Subject: <I>Re: Model selection</I><BR>Date: <I>Wed, 11 Oct 2006 11:42:39 +0200</I><BR>>Hi K S Scot<BR>><BR>>KSS> I'm reading a paper that has used log likelihood ratio tests and Bayesian<BR>>KSS> Information Criterion for model selection. I'm not sure whether of either<BR>>KSS> of these were done in SPSS, so am looking for a little advice on the<BR>>KSS> procedure. That is, can anyone direct me to some good resources or texts or<BR>>KSS> provide me with any information about these statistical techniques?<BR>><BR>>You don't mention the type of model (linear, logistic, Cox,<BR>>Poisson, nominal,
ordinal.. regression).<BR>><BR>>LR tests are part of the standard output of SPSS for any model but<BR>>linear regression. BIC can be obtained for linear regression models<BR>>(subcommand /SELECTION, it must be added thru syntax).<BR>><BR>>Right now I can't think of a book that covers those topics, I'll check<BR>>the University library and see if I find someone.<BR>><BR>><BR>>--<BR>>Regards,<BR>>Dr. Marta García-Granero,PhD mailto:biostatistics@terra.es<BR>>Statistician<BR>><BR>>---<BR>>"It is unwise to use a statistical procedure whose use one does<BR>>not understand. SPSS syntax guide cannot supply this knowledge, and it<BR>>is certainly no substitute for the basic understanding of statistics<BR>>and statistical thinking that is essential for the wise choice
of<BR>>methods and the correct interpretation of their results".<BR>><BR>>(Adapted from WinPepi manual - I'm sure Joe Abrahmson will not mind)<BR></FONT></BLOCKQUOTE></DIV></div><br clear=all><hr>Fed up with spam in your inbox? <a href="http://g.msn.com/8HMAENUK/2743??PS=47575" target="_top">Find out how to deal with junk e-mail here!</a> </html>
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