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.
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