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From |
Ronan Conroy <rconroy@rcsi.ie> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: Inconsistent results with rocfit |

Date |
Tue, 2 Mar 2010 11:09:59 +0000 |

On 25 Feabh 2010, at 18:30, Paul Seed wrote:

Dear Statalist, An odd problem has come up. I have two versions on the same predictor (as measured & logged) , and one binary outcome. When I use -roctab-, I get identical estimates of the ROC area. when I use -rocfit-, I do not.

. rocfit diagnosis logbnp1 , cont(5)

However, . rocfit diagnosis bnp1, cont(5)

-> tabulation of cut_bnp1 cut_bnp1 | Freq. Percent Cum. ------------+----------------------------------- 1 | 109 83.85 83.85 2 | 15 11.54 95.38 3 | 3 2.31 97.69 4 | 2 1.54 99.23 5 | 1 0.77 100.00 ------------+----------------------------------- Total | 130 100.00 -> tabulation of cut_logbnp1 cut_logbnp1 | Freq. Percent Cum. ------------+----------------------------------- 1 | 24 18.46 18.46 2 | 46 35.38 53.85 3 | 54 41.54 95.38 4 | 6 4.62 100.00 ------------+----------------------------------- Total | 130 100.00

This email has been cc'd to tech support! Ronan Conroy ================================= rconroy@rcsi.ie Royal College of Surgeons in Ireland Epidemiology Department, Beaux Lane House, Dublin 2, Ireland +353 (0)1 402 2431 +353 (0)87 799 97 95 +353 (0)1 402 2764 (Fax - remember them?) http://rcsi.academia.edu/RonanConroy P Before printing, think about the environment * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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