Thread: Q9, SVM vs PLA
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Old 05-23-2013, 05:57 AM
catherine catherine is offline
Join Date: Apr 2013
Posts: 18
Default Re: Q9, SVM vs PLA

Originally Posted by Elroch View Post
You can think of it like this. How big are the sets of misclassified points in the two experiments? How many of your 1000 points are misclassified on average? How accurate an estimate do you think you are getting for each of the misclassified sets?

Actually it's worse than if you want to estimate the misclassification error for one method, as if M_{PLA} and M_{SVM} are the two sets of misclassified points, you are only interested in the points that are in one set but not the other.

Note: if you have a fraction f of a set that you are trying to estimate and you use N sample points, it's not difficult to calculate the standard deviation on such an estimate, which you can use to get a very good handle on how reliable your estimates and conclusions are.
Hi Elroch, from your comment above I understand that my test set was too small. How large should it be? How did you go about estimating the 'disagreement' between the target function and the final PLA / SVM hypotheses? According to the HW instructions, this 'disagreement' can be either calculated exactly or approximated by generating a sufficiently large set of points to evaluate it. How would you one about calculating it exactly?
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