From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>

Date: Tue 06 Dec 2005 - 04:11:46 EST

Dimitris Rizopoulos

Ph.D. Student

Biostatistical Centre

School of Public Health

Catholic University of Leuven

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Dec 06 04:31:43 2005

Date: Tue 06 Dec 2005 - 04:11:46 EST

there are possibilities to analyze such kind of data under an IRT framework, e.g., look at

Moustaki, I. (1996). A latent trait and a latent class model for mixed observed variables. British Journal of Mathematical and Statistical Psychology, 49

Moustaki, I. and Knott, M. (2000). Generalised Latent Trait Models. Psychometrika, 2000, 65, 391-411

I hope it helps.

Best,

Dimitris

Dimitris Rizopoulos

Ph.D. Student

Biostatistical Centre

School of Public Health

Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://www.med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm

- Original Message ----- From: "ronggui" <042045003@fudan.edu.cn> To: <r-help@stat.math.ethz.ch> Sent: Monday, December 05, 2005 5:34 PM Subject: [R] how to construct an index or classify the cases with the combination of categorical and continuous variables

>I have such a dataset.

*> x1 x2 x3 x4
**> 1 1 0 2
**> 0 1 1 10
**> 1 0 1 30
**> ......
**>
**> x1,x2,x3 are categorical variable(the value can be 0 or 1),and x4 is
**> a continuous variable.
**> x1,x2,x3,x4 is the manifest(measurable) variables which reflect one
**> immeasurable variable.
**> If all of x1-x4 are continuous variables,I can do factor analysis to
**> extract the immeasurable "variable",but some of them are categorical
**> variable which violate the assumptions of factor analysis.So is
**> there anyway to extract the immeasurable "variable" or construct an
**> index based on these variable?
**>
**> If NOT,then is there any way to classify the cases in to two
**> categories? If all the variables are binary,I can use latent class
**> analysis to do it,but how about binary variables plus countinuous
**> variables?
**>
**> It is not a R question,I just want some one help me out!
**> Thank you !
**>
**>
**> 2005-12-06
**>
**> ------
**> Deparment of Sociology
**> Fudan University
**>
**> My new mail addres is ronggui.huang@gmail.com
**> Blog:http://sociology.yculblog.com
**>
**>
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*> ______________________________________________
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*> https://stat.ethz.ch/mailman/listinfo/r-help
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Dec 06 04:31:43 2005

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