Re: [R] Harrell's C

From: Wachtel, Mitchell <>
Date: Mon, 04 Jun 2007 15:34:22 -0500

Dear Professor Harrell:

Thank you so much for your excellent advice. I just installed the proper version of Hmisc, which works perfectly. Hmisc yields Harrell's C (rcorr.cens); all one need do is calculate the expected value for the risk for each patient and make that the X variable. You are a wonderful influence on all who perform statistics.

With kindest regards.

Mitchell S. Wachtel, MD

-----Original Message-----
From: Frank E Harrell Jr [] Sent: Saturday, June 02, 2007 5:01 PM
To: Wachtel, Mitchell
Cc:; Thomas Dupont Subject: Re: [R] Harrell's C

Wachtel, Mitchell wrote:
> R will not let me load Design or Hmisc anymore. I need to calculate
Harrell's C for some survival analyses. Can anyone provide an R formula for Harrell's C?
> With kindest regards.
> Mitchell Wachtel, MD

You provided very little information. We have had no reports of Hmisc not loading under Windows but Design is not currently available for Windows for R 2.5. We are working to fix that.


Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt

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Received on Mon 04 Jun 2007 - 20:41:58 GMT

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