R help - Jan 2010 - Are unpaired data suitable for DiagnosisMed's Diagnosis ?

Dear,

I wanna to compare AUC generated by two distribution models using the same
sample.

The AUC for model 1 consists of two columns, column A for 0/1 and column B
for probability, eahc with the same row number of 3000.
The AUC for model 2 consists of two columns, column A for 0/1 and column B
for probability, eahc with the same row number of 10000 rows.

I am wondering what value I should put in for gold and test in this
function.

Please kindly help and thank you.

Elaine

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elaine kuo wrote:
>  Dear,
> 
> I wanna to compare AUC generated by two distribution models using the same
> sample.
> 
> The AUC for model 1 consists of two columns, column A for 0/1 and column B
> for probability, eahc with the same row number of 3000.
> The AUC for model 2 consists of two columns, column A for 0/1 and column B
> for probability, eahc with the same row number of 10000 rows.
> 
> I am wondering what value I should put in for gold and test in this
> function.
> 
> Please kindly help and thank you.
> 
> Elaine
Hmisc's improveProb (Pencina's methods) exists because comparisons of 
AUC have low power.  If you want to compare AUCs a more direct approach 
is with rcorrp.cens in Hmisc.

You are confusing data for AUC which is a single summary measure.  I 
don't think you are using the term AUC in the right context.

Please consolidate your multiple queries into one note next time.

Frank
> 
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> 
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-- 
Frank E Harrell Jr   Professor and Chairman        School of Medicine
                      Department of Biostatistics   Vanderbilt University