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Logistic Regression Cost Function

  1. Jul 5, 2012 #1
    Hi,
    I am studying logistic regression and gradient ascent and have seen it used with a cost function and without one. Could anyone tell me why you would use a cost function? It seems just as effective without one.

    alpha = .05

    h = data * weights
    error = labels - sigmoid(h)
    weights = weights + alpha * data * error

    At this point I would think I can just loop through the above code and break when "error" converges. However, I've also seen code where you would pass "weights" to a cost function and break when the cost function converges. Please let me know if you need more information from me. Thanks
     
  2. jcsd
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