takiy berrandou
2016-Jun-14 14:43 UTC
[R] is there a package in R or functions to calculate odds/hasard ratio from spline regression
Hello, I'm looking for a package or function, which calculate OR/HR from spline model regression. for example in SAS it exist some MACRO helping to do that easiely. i had make some research on the forum here and on the web but without any succes. thanks for the answers. Takiy -- Takiy BERRANDOU 0618916037 takiyeddine at gmail.com [[alternative HTML version deleted]]
David Winsemius
2016-Jun-15 15:56 UTC
[R] is there a package in R or functions to calculate odds/hasard ratio from spline regression
> On Jun 14, 2016, at 7:43 AM, takiy berrandou <takiyeddine at gmail.com> wrote: > > Hello, > > I'm looking for a package or function, which calculate OR/HR from spline > model regression. for example in SAS it exist some MACRO helping to do that > easiely. > > i had make some research on the forum here and on the web but without any > succes. >It's not yet clear what you want to do. Odds ratios are easily calculated from logistic regression models (typically constructed with the glm function the stats package) and hazard ratios are easily calculated from survival models (typically constructed with survreg or coxph in the survival package). All those functions accept spline terms in their formula versions. There are many worked examples that could be found with google searching since google now properly interprets the letter "r" as referring to the computer language. You can get a more focussed search using rseek.com.> > [[alternative HTML version deleted]]You should read the posting guide. Rhelp is a plain text mailing list.> > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.David Winsemius Alameda, CA, USA
Leonardo Fontenelle
2016-Jun-15 16:08 UTC
[R] is there a package in R or functions to calculate odds/hasard ratio from spline regression
Em Ter 14 jun. 2016, ?s 11:43, takiy berrandou escreveu:> Hello, > > I'm looking for a package or function, which calculate OR/HR from spline > model regression. for example in SAS it exist some MACRO helping to do > that > easiely. > > i had make some research on the forum here and on the web but without any > succes. >One, there are functions/packages to calculate OR/HR. Two, there are functions/packages to use splines as predictors, instead of the usual linear effect. As David said, "odds ration in R" and so on is a great way to find what you want. Att, Leonardo Ferreira Fontenelle, MD, MPH PhD candidate in epidemiology, Federal University of Pelotas Professor of medicine, Vila Velha University Legislative consultant in health, Municipal Chamber of Vit?ria.
takiy berrandou
2016-Jun-15 16:12 UTC
[R] is there a package in R or functions to calculate odds/hasard ratio from spline regression
Hello, thank you for the answer. it's true i was'nt clear enough. the problem with glm()/gam or coxph() when the spline terms are used (specialy spline of 3rd degree) the calculated coefficients for the spline terms are difficult to interpret. for example for spline of degree=3 and 3 knots, there are 7 beta's calculated, and to represent the result clearly we need to calculate OR/HR against a reference. just making exp(beta) does'nt have a propre meaning. On SAS there are some MACRO's like %regspline which help to make some calcul to figure out the OR's. Thank's again for the answers 2016-06-15 17:56 GMT+02:00 David Winsemius <dwinsemius at comcast.net>:> > > On Jun 14, 2016, at 7:43 AM, takiy berrandou <takiyeddine at gmail.com> > wrote: > > > > Hello, > > > > I'm looking for a package or function, which calculate OR/HR from spline > > model regression. for example in SAS it exist some MACRO helping to do > that > > easiely. > > > > i had make some research on the forum here and on the web but without any > > succes. > > > > It's not yet clear what you want to do. Odds ratios are easily calculated > from logistic regression models (typically constructed with the glm > function the stats package) and hazard ratios are easily calculated from > survival models (typically constructed with survreg or coxph in the > survival package). All those functions accept spline terms in their formula > versions. There are many worked examples that could be found with google > searching since google now properly interprets the letter "r" as referring > to the computer language. You can get a more focussed search using > rseek.com. > > > > > > > [[alternative HTML version deleted]] > > You should read the posting guide. Rhelp is a plain text mailing list. > > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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. > > David Winsemius > Alameda, CA, USA > >-- Takiy BERRANDOU 0618916037 takiyeddine at gmail.com [[alternative HTML version deleted]]