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math/stat question (OT)

Posted By: rambiz
Date: Saturday, 23 July 2011, at 9:47 p.m.

In Response To: math/stat question (OT) (Bob Koca)

Shall you be talking about the way I want to calculate the variance, I don't want to make any assumptions actually. I just planned to use the simple var=(1/N-1)*SUM{ni*(xi-x_bar)^2} formula.
So far I can only see the constraint on the total probability as a must.

One could of course fit many different curves to given data, but I have no clue of curve fitting. I could just find a straight line so that the Sum of the errors squared is minimum, but again I'm sure Chuck already knows about it and also about my suggestion to use the "ranges".

Ah, yes! Actually as we are talking of discrete random variables, a curve fitting procedure makes little sense as we are looking for a probability mass function and not a probability density function. It's getting interesting...

Messages In This Thread

• math/stat question (OT)
  Chuck Bower -- Saturday, 23 July 2011, at 5:42 p.m.
  • Clarification
    Chuck Bower -- Saturday, 23 July 2011, at 7:15 p.m.
  • math/stat question (OT)
    rambiz -- Saturday, 23 July 2011, at 8:00 p.m.
    • math/stat question (OT)
      Bob Koca -- Saturday, 23 July 2011, at 8:57 p.m.
      • math/stat question (OT)
        rambiz -- Saturday, 23 July 2011, at 9:47 p.m.
        • NOW I understand why you guys are struggling
          Chuck Bower -- Saturday, 23 July 2011, at 10:14 p.m.
          • Siamese or Persian!?
            rambiz -- Sunday, 24 July 2011, at 12:59 a.m.
          • NOW I understand why you guys are struggling
            Casper van der Tak -- Sunday, 24 July 2011, at 8:30 a.m.
          • my solution
            Chuck Bower -- Monday, 25 July 2011, at 3:40 p.m.
        • But for each value of i you have a different number of measurements
          rambiz -- Sunday, 24 July 2011, at 12:45 a.m.