Results 1 to 3 of 3

Math Help - Moment generating function for geometric

  1. #1
    Newbie
    Joined
    Aug 2011
    Posts
    7

    Moment generating function for geometric

    geometric distribution given by

     Pr(X=x) = (1/a)(1-(1/a)^{x-1}) where a > 1.

    Am I right in saying the distribution above is the same as

     Pr(X=x) = p(1-p)^{x-1} which is just the normal geometric pdf or does the change from p to 1/a change something else
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Moo
    Moo is offline
    A Cute Angle Moo's Avatar
    Joined
    Mar 2008
    From
    P(I'm here)=1/3, P(I'm there)=t+1/3
    Posts
    5,618
    Thanks
    6

    Re: Moment generating function for geometric

    Hello,

    It doesn't change anything, but I just don't understand where the MGF is in there ?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4

    Re: Moment generating function for geometric

    Quote Originally Posted by whiteboard View Post
    geometric distribution given by

     Pr(X=x) = (1/a)(1-(1/a)^{x-1}) where a > 1.

    Am I right in saying the distribution above is the same as

     Pr(X=x) = p(1-p)^{x-1} which is just the normal geometric pdf or does the change from p to 1/a change something else
    What is raised to the power (x-1) in each of these cases? (and is it a typo?)

    CB
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Moment Generating Function of geometric rv
    Posted in the Statistics Forum
    Replies: 5
    Last Post: September 23rd 2010, 01:45 PM
  2. moment generating function of geometric distribution
    Posted in the Advanced Statistics Forum
    Replies: 6
    Last Post: December 5th 2009, 12:21 PM
  3. Discrete Geometric Moment Generating Function
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: November 8th 2009, 04:38 AM
  4. Replies: 5
    Last Post: August 7th 2009, 11:22 PM
  5. geometric moment generating function
    Posted in the Statistics Forum
    Replies: 1
    Last Post: March 18th 2009, 06:39 PM

/mathhelpforum @mathhelpforum