[R] How to make a nomogam and Calibration plot

[Frank Harrell]

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 <surgeon666666 at 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
>>
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> 
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-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
--
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