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Deciding Bins for Chi Square Tests

  1. Mar 12, 2012 #1
    1. The problem statement, all variables and given/known data
    I know that for a Chi Square test to adequately describe a distribution, you need each bin to have an estimated frequency > 5. As a rule of thumb though, do I want to pool the bins with less than 5 estimated frequency so as to maximize the number of bins or minimize them?
    For instance say we have:
    (first column is the bin number, second column is estimated frequency of that bin)
    Bin# Estimated Frequency
    1 6
    2 3
    3 4
    4 3
    5 3

    Which way would we pool bins?
    Method 1)
    Bin # Estimated Frequency
    1 6
    2+ 13

    or
    Method 2)
    Bin # Estimated Frequency
    1 6
    2-3 7
    4-5 6
     
  2. jcsd
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