How to evaluate a logistic regression classifier?

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Aaronne
Aaronne 2013-3-22
Hi Smart Guys,
I wrote following codes to construct a logistic regression classifier. Essentially, it uses the Matlab GeneralizedLinearModel class.
load fisheriris;
features = meas(1:100,1:3);
featureSelcted = features(1:100,1:3);
numFeatures = 100;
%%Define ground truth
groundTruthGroup = species(1:100);
groundTruthLogicalLable = (1:numFeatures)'<50;
LOGClassifierObject = GeneralizedLinearModel.fit(featureSelcted, groundTruthLogicalLable, ...
'linear', 'Distribution', 'binomial', 'link', 'logit');
[LOGLabel, LOGScore] = predict(LOGClassifierObject, featureSelcted);
[FPR, TPR, Thr, AUC, OPTROCPT] = perfcurve(groundTruthGroup(:,1), LOGScore(:,1), 'setosa');
However, I'm stuck with the problem of evaluate this logistic regression based classifier. For example,
1. As it is not LOGClassifierObject is not an object of 'ClassificationDiscriminant', it has no function to get resubstitution error directly. 'classperf' function seems not applicable as well.
2. Also for a normal cross-validation, I haven't figured out how to do it. I am not sure how to connect 'crossval' function with the results of the object of GeneralizedLinearModel class, ie, LOGClassifierObject.
3. Or could anyone recommend a third party library coded in Matlab can perform the right task.
Any ideas please direct me. Thanks very much.
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