Results 1 to 4 of 4

Math Help - F-test : What happens if your dgf is too big ?

  1. #1
    Newbie
    Joined
    Oct 2009
    Posts
    12

    F-test : What happens if your dgf is too big ?

    Hi guys ,

    I have a question about F-tables.
    What value should I put for the F 20000,17000 , would it be correct to use the same value for the last value in my F- table which is 1.32 for F infinty, 60 ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,763
    Thanks
    5
    I use online calculators...
    The one I usually use didn't work well with 1000 and 2000 dfs
    BUT I just found this
    http://davidmlane.com/hyperstat/F_table.html
    I just put used 100,000 and 200,000 dfs.
    AND I checked with the percentile point of 1.
    I know that as the df goes to infinity that the mean converges to 1.
    And it 'worked'.
    There's also these tables....
    http://www.danielsoper.com/statcalc/calc08.aspx
    Note that there are F tables if you look on top.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Oct 2009
    Posts
    12
    so is 1 the tail probability and also is this only true for f table or all kind of tables ?

    oh btw thx for the links eagle
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,763
    Thanks
    5
    E(F_{a,b})\to 1 as b goes to infinity
    The mean of a chi-square is it's dfs, which is why the mean of an F is near 1.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Clarification of Root Test & Ratio Test
    Posted in the Calculus Forum
    Replies: 4
    Last Post: July 28th 2010, 08:45 AM
  2. Replies: 2
    Last Post: May 21st 2010, 10:56 AM
  3. Replies: 8
    Last Post: March 28th 2010, 06:45 PM
  4. Replies: 7
    Last Post: June 4th 2009, 10:33 PM
  5. ratio test (series) urgent test tommorow!
    Posted in the Calculus Forum
    Replies: 3
    Last Post: December 2nd 2008, 04:27 PM

Search Tags


/mathhelpforum @mathhelpforum