Sorry Gaurav,

 

I'll make sure I mark a copy to r-help also.

 

As I have told, I'm new to R and even to statistics, so it will take some time for me to learn it.

 

Just help me get a simple ROC curve, please give an example of your own and explain the steps, no mater if its biology or any other field, I just need to get the logic behind it.

 

Thanks & Regards

Rithesh M Mohan

 

 

________________________________

From: gyadav@ccilindia.co.in [mailto:gyadav@ccilindia.co.in] 
Sent: Monday, July 30, 2007 4:28 PM
To: Rithesh M. Mohan
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] ROC curve in R




Hi Ritesh 
***please note Ritesh always mark a copy to the R-help mailing list :) ***

Please visit this link to get help in R 
http://rocr.bioinf.mpi-sb.mpg.de/ROCR_Talk_Tobias_Sing.ppt#384,8,Examples (2/8): Precision/recall curves 

futher :) what do you mean by PSA and cohort :) after some googling i got this 

co·hort(khôrt) 
n. 
1. A group or band of people. 
2. A companion or associate. 
3. A generational group as defined in demographics, statistics, or market research: "The cohort of people aged 30 to 39 . . . were more conservative" American Demographics. 
4. 
a. One of the 10 divisions of a Roman legion, consisting of 300 to 600 men.
b. A group of soldiers. 

and for PSA i got  Prostate-specific antigen. A substance produced by the prostate that may be found in an increased amount in the blood of men who have prostate cancer, benign prostatic hyperplasia, or infection or inflammation of the prostate. 

Now please clarify what you want to model :) please dont take it otherwise i am not from biology field. Please clarify :) 


Regards,

Gaurav Yadav
+++++++++++
Assistant Manager, CCIL, Mumbai (India)
Mob: +919821286118 Email: emailtogauravyadav@gmail.com
Bhagavad Gita:  Man is made by his Belief, as He believes, so He is 



"Rithesh M. Mohan" <rithesh.m@brickworkindia.com> 

07/30/2007 01:30 PM 

To

<gyadav@ccilindia.co.in> 

cc



Subject

Re: [R] ROC curve in R










Hi Gaurav, 
  
Need your help, I'm relatively new to R or even stats, so can you please give me step by step details to get ROC curve in R. 
  
Requirement. 
  
To build ROC curve using only PSA(variable) alone of the original cohort against the ROC of the Model of the original cohort. 
  


It would be really great if you could help me with this. 


  
Thanks and Regards 
Rithesh 

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