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Re: st: Sensitivity and specificity graphs for binary vars


From   Nick Cox <[email protected]>
To   [email protected]
Subject   Re: st: Sensitivity and specificity graphs for binary vars
Date   Wed, 23 May 2012 13:40:47 +0100

Why do you need or want a graph at all?(*) All the information is
summarised efficiently by those four totals.

Nick

(*) Longstanding Statalist members are asked not to quote me saying
this out of context.

On Wed, May 23, 2012 at 1:29 PM, King, Carina <[email protected]> wrote:

> I have two binary variables, one being a 'gold standard' indicator of infection and the other based on a coded predictor. I have calculated the sensitivity and specificity (using -diagt-) of the coded predictor for identifying the 'gold standard' infections, but want to represent it graphically. I have looked at the ROC commands, including -roctab- and -roccomp- but don't think these are right as both my variables binary variables. My questions are whether a Detection Error Trade-Off graph is appropriate? Or is there another type of graph that would show the sensitivity and specificity well? And are they possible in Stata?
>
> I am using Stata SE 11
>
> Two-way table of my data:
>
>                Negative (gold standard) Positive (gold standard)
> Negative (coded)        542 (true neg)          9 (false neg)
> Positive (coded)        21 (false pos)          26 (true pos)
>

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