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

Sample mean

  1. Aug 6, 2013 #1
    What is the sample mean of the following matrix?

  2. jcsd
  3. Aug 6, 2013 #2


    User Avatar
    Science Advisor

    I'm afraid you are going to have to define "sample mean" for a matrix. I have never seen that term before. I suspect that the entries in the matrix are "samples" of some kind but you did not say that.

    IF the entries are the "samples" and you are asking for the mean of these numbers then "1, 2, 3, ... 14, 15, 16" are an arithmetic series and the mean of such a series is just the mean of largest and smallest values. That is (1+ 2+ 3+ ...+ 15+ 16)/16= (1+ 16)/2= 17/2.
  4. Aug 14, 2013 #3


    User Avatar
    Homework Helper

    If each column represents a different (small) sample the sample mean would be the row matrix of column means. A similar comment would apply if each row is a sample.
    If neither of those descriptions apply then more context is needed.

    Is this from a multivariate problem?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook