[R] Nagelkerke R square for Prediction data
Frank E Harrell Jr
f.harrell at vanderbilt.edu
Wed Oct 22 15:21:33 CEST 2008
Chuck Cleland wrote:
> On 10/22/2008 6:05 AM, Tobias Erik Reiners wrote:
>> Dear Helpers,
>> I tries to find an Package or script which deals with Nagelkerke R square.
>> I got Prediction data from Habitatmodels for an animal. Some researchers
>> use the the Nagelkerke R Square to confirm the Goodness of model. I
>> would like to do this as well.
>> 1 0.9847
>> 1 0,7653
>> 0 0,2456
>> 0 0,0457
>> THanks a lot
> RSiteSearch("Nagelkerke", restrict="function")
> suggests lrm() in the Design package by Frank Harrell.
Thanks Chuck, and note Tobias that no R^2 measures goodness of fit but
rather explained variation or predictive discrimination. R^2 can be
high and there be a major misspecification in the model (e.g., omitting
an interaction or nonlinearity term or omitting an important variable).
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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