rcspline.problem
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 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.
----- 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.