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.
Data:
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
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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