Please follow the posting guide. You didn't state which package you are using and didn't include a trivial self-reproducing example that causes the error.
For your purpose the rms package is going to plot restricted cubic spline fits (and shaded confidence bands) more flexibly. Frank Haleh Ghaem Maralani wrote: > > Dear Dr ; > > > I am a PhD student at Epidemiology department of National University of > Singapore. I used R command (rcspline.plot) for plotting restricted > cubic > spline – the model is based on Cox. I managed to get a plot > without > adjustment for other covariates, but I have a problem regarding to > adjusting the confounders. > > I applied below command to generate the matrix for covariates. > > m=as.matrix(age,sex) or m1=matrix(age,sex) or m2=cbind(age,sex) > > But, when I input ..... adj=m, or adj=m1, or adj=m2...... in the > model, R > gives below error: > > > Error in pchisq(q, df, lower.tail, log.p) : > > Non-numeric argument to mathematical function > > In addition: Warning message: > > In coxph.fit(cbind(x, xx, adj), cbind(y, event), strata = NULL, : > > Loglik converged before variable 1,2,3,4 ; beta may be infinite. > > > I would be grateful if you take my issue into your consideration and > help me > on this case > > > Sincerely Yours > > > Haleh Ghaem > > PhD student, NUS > ______________________________________________ > R-help@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. > ----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/rcspline-problem-tp3501627p3502623.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@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.
