Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Speed of ROC analysis

From   "Shaw, Jim (NIH/NCI)" <>
To   "''" <>
Subject   st: Speed of ROC analysis
Date   Mon, 14 Jul 2003 14:57:36 -0400

Dear Statalist:
Has anyone developed faster versions of roctab or roccomp (using DeLong et
al.'s estimated standard errors)?  The versions available in Stata 8 (as
well as in earlier versions of Stata) run very slowly when used with large
samples (e.g., 500-1000 observations).  For example, in simulations I have
been performing, it generally takes about 24 hours to complete 1000
repetitions of roccomp in samples consisting of 1000 observations each.  I
suspect the problem is related to the fact that all possible pairwise
comparisons are being made between scores for true-positive and
true-negative subjects.  
James Shaw
Research Associate
College of Pharmacy
The University of Arizona
*   For searches and help try:

© Copyright 1996–2023 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index