Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. A test statistic that is calculated as the sum of the squares of observed values minus expected values divided by the expected values.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A test statistic used in the chisquare test.
Etymologies
Sorry, no etymologies found.
Examples

Goodness of fit between different documents was obtained by computing the so called Q value from the standard chisquare hypothesis test.

"Using the chisquare statistic," observes one professor, "Obama's and Ayers's books were indistinguishable, while Obama's book was easily distinguishable from books by other authors."

I did a chisquare "goodness of fit" test and got a P value of 0.18.

Now, let's apply the chisquare test to each set of the following madeup numbers.

By a chisquare test, this has a 99% probability of indicating an increased confusion of flaunt for flout.

Rabett Labs hitched up the IBM computators bought cheap from the Manhattan Project, shanghaied recruited a bunch of young volunteers, and found that for this case Pearson's chisquare statistic is 94, which means that the probability of the null hypothesis being true is 4.5 x 1018 or about as likely as Ethon going vegan.

But applying Pearson's chisquare assumes a lot more than that!

So the result from Pearson's chisquare is correct, and we can conclude that EITHER earthquake occurrence is related to day of the week, OR earthquake occurences are correlated, or both.

Another commenter and I did have some discussion about it a while back in which chisquare came up.

He suggested reading the Wiki article on the chisquare test.
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