View previous topic :: View next topic |
Author |
Message |
Stig Holmquist Guest
|
Posted: Tue Apr 19, 2005 11:00 am Post subject: Chi square test of Pick-4 |
|
|
Consider 50 draws of a Pick-4 game and assume that half the
digits have been drawn 16 times and the other half 24 times,
a highly unrealistic event.
Now test these results with the chi-square goodness of fit method
and you find the value 10x16/20=8. Now look up this value in a
chi-square table under 9 df and you find a probability of about 50%.
Does this make sense? What am I doing wrong?
Stig Holmquist |
|
Back to top |
|
|
Paracelsus Guest
|
Posted: Tue Apr 19, 2005 9:03 pm Post subject: Re: Chi square test of Pick-4 |
|
|
"Stig Holmquist" <[email protected]> wrote in message
news:[email protected]...
| Consider 50 draws of a Pick-4 game and assume that half the
| digits have been drawn 16 times and the other half 24 times,
| a highly unrealistic event.
| Now test these results with the chi-square goodness of fit method
| and you find the value 10x16/20=8. Now look up this value in a
| chi-square table under 9 df and you find a probability of about 50%.
| Does this make sense? What am I doing wrong?
|
I can't see any error in your calculations.
Because the chi-square goodness-of-fit test is summative and
non-directional, it cannot 'see' the peculiarity of your hypothetical
scenario. Maybe there is a better test for this, but I've no idea what that
might me.
Or maybe the scenario you suggest is not really as unrealistic as it seems
intuitively?? |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
Powered by phpBB 2.0.11 © 2001, 2002 phpBB Group
|