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A single stage cascaded classifier simply doesn't exist. You can only get a single weak classifier which cannot be a cascaded structure. Knowing this, you should simple select minimum 2 stages for a cascaded classifier.
If you do not understand what i mean, go read the paper of viola&jones, suggesting a cascaded approach for face detection. It will make it more clear for you: http://research.microsoft.com/en-us/um/people/viola/Pubs/Detect/violaJones_CVPR2001.pdf
