# ordinal logistic regression diagnostic

8 messages
Open this post in threaded view
|

## ordinal logistic regression diagnostic

 Good day Stata-listers, I'm currently  running an ordinal logistic regression, all the predictors are categorical, In order for my analysis to be valid, my model has to satisfy the assumptions of ordinal  logistic regression, the problem is that all what I could find out   is material related to the diagnostic of the logistic regression  and more rarely some hints related to ologit but that don't seem to work for my case (for example when I use the fitstat command I get the message: variable _cons not found r(111)) In addition I never came up with a similar model ( ordinal logistic regression with only categorical predictors). So it is statistically correct to run a such model (or do we need at least one quantitative predictor?). Any help would be highly appreciated, Thanks a lot in advance, Ama * *   For searches and help try: *   http://www.stata.com/help.cgi?search*   http://www.stata.com/support/statalist/faq*   http://www.ats.ucla.edu/stat/stata/
Open this post in threaded view
|

## AW: ordinal logistic regression diagnostic

 <> " and more rarely some hints related to ologit but that don't seem to work for my case (for example when I use the fitstat command I get the message: variable _cons not found r(111))" -set trace on- and see where it gets stuck. In this example, Stata completes the task w/o encountering any problems: ************* webuse fullauto, clear ologit rep77 foreign length mpg fitstat ************* HTH Martin -----Ursprüngliche Nachricht----- Von: [hidden email] [mailto:[hidden email]] Im Auftrag von amatoallah ouchen Gesendet: Montag, 26. April 2010 16:24 An: [hidden email] Betreff: st: ordinal logistic regression diagnostic Good day Stata-listers, I'm currently  running an ordinal logistic regression, all the predictors are categorical, In order for my analysis to be valid, my model has to satisfy the assumptions of ordinal  logistic regression, the problem is that all what I could find out   is material related to the diagnostic of the logistic regression  and more rarely some hints related to ologit but that don't seem to work for my case (for example when I use the fitstat command I get the message: variable _cons not found r(111)) In addition I never came up with a similar model ( ordinal logistic regression with only categorical predictors). So it is statistically correct to run a such model (or do we need at least one quantitative predictor?). Any help would be highly appreciated, Thanks a lot in advance, Ama * *   For searches and help try: *   http://www.stata.com/help.cgi?search*   http://www.stata.com/support/statalist/faq*   http://www.ats.ucla.edu/stat/stata/* *   For searches and help try: *   http://www.stata.com/help.cgi?search*   http://www.stata.com/support/statalist/faq*   http://www.ats.ucla.edu/stat/stata/
Open this post in threaded view
|

## Re: AW: ordinal logistic regression diagnostic

 In reply to this post by amatoallah ouchen Thanks a lot Martin for your prompt answer, But in the example you gave  below, you have  used 2 quantitative variables (length and mpg) , the problem I mentioned occur when only using  qualitative variables, If I reuse  your example webuse fullauto, clear ologit  rep77 rep78 model -fitstat- variable _cons not found r(111)) I think that my issue is more clear now, * *   For searches and help try: *   http://www.stata.com/help.cgi?search*   http://www.stata.com/support/statalist/faq*   http://www.ats.ucla.edu/stat/stata/
Open this post in threaded view
|

## Re: ordinal logistic regression diagnostic

 In reply to this post by amatoallah ouchen --- On Mon, 26/4/10, amatoallah ouchen wrote: > I'm currently  running an ordinal logistic regression, > all the predictors are categorical, In order for my > analysis to be valid, my model has to satisfy the > assumptions of ordinal logistic regression, the problem > is that all what I could find out is material related to > the diagnostic of the logistic regression and more > rarely some hints related to ologit but that don't seem > to work for my cas There is a lot of material available from this websit by Rich Williams: You can also consider the -brant- command, which is part of -spost9- (see: -findit spost-). Rich and I did ran quite a bit of simulation to assess the performance of that test, see the thread starting with: I believe the end conclusion was that each category of your dependent variable needs to contain "enough" observations for the test to perform well. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl--------------------------       * *   For searches and help try: *   http://www.stata.com/help.cgi?search*   http://www.stata.com/support/statalist/faq*   http://www.ats.ucla.edu/stat/stata/
Open this post in threaded view
|

## AW: st: AW: ordinal logistic regression diagnostic

Open this post in threaded view
|

## Re: AW: ordinal logistic regression diagnostic

 In reply to this post by amatoallah ouchen Greetings, Thank you very much Martin and Maarten, Martin: you are right my fitstat version was an old one, Maarten: thank you very much for the materials, Regards, Ama. * *   For searches and help try: *   http://www.stata.com/help.cgi?search*   http://www.stata.com/support/statalist/faq*   http://www.ats.ucla.edu/stat/stata/