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From |
Bryan Sayer <bsayer@chrr.osu.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: S-Curve/logistic curve regression |

Date |
Wed, 01 Apr 2009 13:47:29 -0400 |

Bryan Sayer Health Data Systems and Analysis (HDSA) Center Monday to Friday, 8:30 to 5:00 Phone: (614) 442-7369 FAX: (614) 442-7329 BSayer@chrr.osu.edu www.s-3.com Nick Cox wrote:

Some people would use -nl- here, but assuming that you can scale values to values / maximum, you can still use a logit link, or linear regression on a logit transformed variable. The only obvious problem is if the bounds are attained, because logit(0) and logit(1) areindeterminate.There are some related comments inSJ-8-1 gr0032 . . . . . . . Stata tip 59: Plotting on any transformed scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q1/08 SJ 8(1):142--145 (no commands) tip on how to graph data on a transformed scalewhich explains how to plot continuous responses on a logit scale.Nickn.j.cox@durham.ac.ukSven Wiese I have a twodimensional dataset of two continious variables and want to fit a regression to the data, but I want the outcome to be an s-Curve (or logistic curve). I think it might be like fitting a polynomial to the data, but as mentioned I want to fit an s-curve, which can be expressed by the exponential function. I am aware of the logistic regression, the difference is, that my dependant variable is not binary. * * 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/

**References**:**st: S-Curve/logistic curve regression***From:*Sven Wiese <SvenWiese@web.de>

**st: RE: S-Curve/logistic curve regression***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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