I want to add a comment related to the calibration plot that was presented in a previous post (which probably cannot be done optimally in SPSS). The plot lacks sufficient resolution in the x-axis values that are calibrated. It is far better to use loess to estimate a smooth nonparametric calibration curve, with no (arbitrary) binning of x. And it is not adequate to validate only the 3-4 points that were plotted. Frank
yz wrote: > > Nomogram is user-friendly, but the equation is also acceptable. It should > be > kept in mind that the process of model development really counts. > > BTW: You can calculate C-index (AUC) in SPSS. Calibration plot can also be > plotted (may be manually) from the result of SPSS. > > *Yao Zhu* > *Department of Urology > Fudan University Shanghai Cancer Center > Shanghai, China* > > > 2011/8/1 sytangping <surgeon666...@yahoo.com.cn> > >> Dear R users, >> >> I am a new R user and something stops me when I try to write a academic >> article. I want to make a nomogram to predict the risk of prostate cancer >> (PCa) using several factors which have been selected from the Logistic >> regression run under the SPSS. Always, a calibration plot is needed to >> validate the prediction accuracy of the nomogram. >> However, I tried many times and read a lot of posts with respect to this >> topic but I still couldn't figure out how to draw the nomogram and the >> calibration plot. My dataset and questions in detail are shown in two >> attached files. It will be very grateful if someone can save his/her time >> to >> help for my questions. >> >> Warmest regards! >> >> Ping Tang http://r.789695.n4.nabble.com/file/n3710068/Dataset.xls >> Dataset.xls http://r.789695.n4.nabble.com/file/n3710068/R_help.doc >> R_help.doc >> >> -- >> View this message in context: >> http://r.789695.n4.nabble.com/How-to-make-a-nomogam-and-Calibration-plot-tp3710068p3710068.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. >> > > [[alternative HTML version deleted]] > > ______________________________________________ > 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/How-to-make-a-nomogam-and-Calibration-plot-tp3710068p3717519.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.