Results 1 to 3 of 3

Math Help - How to calculate sample size with low event frequency

  1. #1
    Newbie
    Joined
    Nov 2012
    From
    amsterdam
    Posts
    2

    How to calculate sample size with low event frequency

    How do I calculate the sample size with a really low event frequency.

    I have a population of 2^32 with an unknown distribution. But a event frequency of 0,062%. How do I calculate my sample size? I can pick my sample space at random and have no problem with large spaces (~100.000).

    I'm new in statistics please excuse my ignorance.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,668
    Thanks
    609

    Re: How to calculate sample size with low event frequency

    Hey battler.

    What attribute are you trying to measure? Is it a proportion? Normal mean?

    Basically depending on what this is you will need to then pick a significance value to construct a confidence interval and then solve for n so that the interval is smaller in length than the threshold.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Nov 2012
    From
    amsterdam
    Posts
    2

    Re: How to calculate sample size with low event frequency

    We have a lot of computers in the world. They are being adressed with an IP-address. The total amount of address space is 2^32. However we dont use all this for the internet so roughly it is (2^32)*0.6 . I would like to do some research on a "small" group of computers (lets say 100.000) and than make a estimate for the entire world.
    All computers run different kind of services. I want to take my sample group and see who of them are running this service, and that might tell me something about the amount of computers in the world who run this service. I can choose my sample group completely at random. I prior research showed that roughly 0,062% of the computers in there sample group ran this service. Btw this service is completely random some run it, some dont (as stated in the previous research chances of running this service are small). How large does my sample group need to be in order to state something like this about world wide usage.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: December 20th 2012, 05:35 AM
  2. Calculate the probability of the event
    Posted in the Statistics Forum
    Replies: 1
    Last Post: June 8th 2011, 10:09 AM
  3. sample size?
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: March 17th 2009, 06:54 PM
  4. sample size
    Posted in the Statistics Forum
    Replies: 7
    Last Post: May 12th 2008, 07:22 AM
  5. sample of size
    Posted in the Statistics Forum
    Replies: 0
    Last Post: January 31st 2007, 11:00 AM

Search Tags


/mathhelpforum @mathhelpforum