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st: AW: graphing sensitivity and specificity for a binary test outcome


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: graphing sensitivity and specificity for a binary test outcome
Date   Tue, 10 Nov 2009 09:22:33 +0100

<> 

Have you had a look at -roctab- and friends? Also see -ssc d senspec- by
Roger Newson...



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Michael
McCulloch
Gesendet: Dienstag, 10. November 2009 07:04
An: Statalist Statalist
Betreff: st: graphing sensitivity and specificity for a binary test outcome

Dear Statalist members,

With the following code I simulate diagnostic data and, in the last  
line, estimate specificity (cell A in the 2x2 table) and sensitivity  
(cell D).
What I'm hoping to learn is how to create a bar graph that would  
display the specificity and sensitivity percentages for both methods 1  
and 2.

***
clear
set obs 1000	
set seed 12358	
gen test=1 + int(2*uniform())	
replace test=0 if test==2
replace test=1 in 1/300		
gen disease=0 in 1/500
replace disease=1 in 501/1000
list in 1/20
tab test disease, row
gen device=1 + int(2*uniform())	
bysort device: tab test disease, row
***




Michael McCulloch
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel:	415-407-1357
fax: 	206-338-2391
mm@pinestreetfoundation.org






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