Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Sampling from a population

  1. Aug 30, 2010 #1
    i have a population of items and i calculate how similar each item is to the rest of the items in the population. i store these values in a symmetric nxn similarity matrix. when i look at the distribution of scores, they follow a beta distribution -- most similarity scores are close to 0 (the items are dissimilar) and then they tail off and fewer and fewer are closer to 1 (the items are very similar).

    i want to generate samples from this distribution -- i want to group items together whose distribution of scores is also beta, but only with a lot of the mass centered around the mean and tailing off on both ends (like a hump). these groupings of beta distributions should (i'm pretty sure) naturally form in my data, so my question is: is there a method to sample from my population that gives me a smaller population with a given distribution? any starting point would help...thanks!
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted