3 messages · Leon_Long, Gabor Grothendieck, Greg Snow
I am a bigginer of R language.I need to prepare a PPT which deadline is 15 Nov. 2008. I want to build a regress model with my own formula. The formula is y=100/(1+exp(a+b*X)). I have no idea of the R program,please demonstrate how to do it or give a good sample. Anyone would help me? Thank you very much!
View this message in context: http://www.nabble.com/Please-help-me-about-the-regress-models%21-tp20453522p20453522.html Sent from the R help mailing list archive at Nabble.com.
Check out ?nls for a description and examples.
I am a bigginer of R language.I need to prepare a PPT which deadline is 15 Nov. 2008. I want to build a regress model with my own formula. The formula is y=100/(1+exp(a+b*X)). I have no idea of the R program,please demonstrate how to do it or give a good sample. Anyone would help me? Thank you very much!
I think what you need is a good consultant, and with that deadline don't expect any bargains. You have not specified your problem with enough detail yet, 2 options (there are probably many more) include: Use the nls function with the model as stated Use the lm function starting as lm( log( 100/y - 1 ) ~ x, Those 2 options are based on different models of how the error comes into play, which is more appropriate depends on things that we cannot guess at based on your description. What to do with either model once fit also depends on the question you want answered. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org 801.408.8111
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- project.org] On Behalf Of Leon_Long Sent: Tuesday, November 11, 2008 8:33 PM To: r-help at r-project.org Subject: [R] Please help me about the regress models! I am a bigginer of R language.I need to prepare a PPT which deadline is 15 Nov. 2008. I want to build a regress model with my own formula. The formula is y=100/(1+exp(a+b*X)). I have no idea of the R program,please demonstrate how to do it or give a good sample. Anyone would help me? Thank you very much! -- View this message in context: http://www.nabble.com/Please-help-me- about-the-regress-models%21-tp20453522p20453522.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code.