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st: graphing sensitivity and specificity for a binary test outcome


From   Michael McCulloch <mcculloch@pinestreetfoundation.org>
To   Statalist Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: graphing sensitivity and specificity for a binary test outcome
Date   Mon, 9 Nov 2009 22:03:51 -0800

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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