[R] A question regarding RFreak

From: James Shaw <shawjw_at_gmail.com>
Date: Mon, 18 Apr 2011 16:41:30 -0500

I am using robreg.evol (part of the RFreak package) to fit models via least trimmed squares (LTS) regression and am encountering the following error message when attempting to access the coefficients:

Error in fit1$coef : $ operator not defined for this S4 class.

It appears to me that robreg.evol is not saving the estimates in a form that can be accessed following estimation. According to documentation for RFreak, the function is supposed to return an object of class "evolreg" that contains the parameter estimates. I am uncertain whether the error I am receiving is related to to the version of R being used. I receive the error message when using R version 2.12.1. When using the latest version of R, i.e., 2.13, I receive a Java error message and cannot get RFreak to work at all.


James W. Shaw, Ph.D., Pharm.D., M.P.H.
Assistant Professor
Department of Pharmacy Administration
College of Pharmacy
University of Illinois at Chicago
833 South Wood Street, M/C 871, Room 266
Chicago, IL 60612
Tel.: 312-355-5666
Fax: 312-996-0868
Mobile Tel.: 215-852-3045

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Received on Mon 18 Apr 2011 - 21:43:45 GMT

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