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st: graphing sensitivity and specificity for a binary test outcome
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From |
Michael McCulloch <[email protected]> |
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To |
Statalist Statalist <[email protected]> |
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Subject |
st: graphing sensitivity and specificity for a binary test outcome |
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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
[email protected]
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