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Kernel Estimation

  1. Jul 7, 2015 #1
    Hi there!
    I'm new in the technique of Kernel Estimation, so it could be that the following questions are really elementary. There is something I don't understand about the bandwidths. Using R I have two functions to perform the estimate:
    kde2d from MASS
    bkde2D from KernelSmooth
    Here are my questions
    1) I see from the source code of kde2d that it divides the bandwidth provided by the user by 4 and I've seen this practice also somewhere else. Why the bandwidth is divided by 4?
    2) kde2d perform uses an axis-aligned bivariate normal distribution, while bkde2D uses a standard bivariate normal distibution. Are they the same?

    Thank you
  2. jcsd
  3. Jul 12, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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