Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun 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.
 noun mathematics A
test statistic used in thechisquare test .
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Examples

I did a chisquare "goodness of fit" test and got a P value of 0.18.
Archive 20090301 AYDIN 2009

Now, let's apply the chisquare test to each set of the following madeup numbers.
Archive 20090301 AYDIN 2009

Goodness of fit between different documents was obtained by computing the so called Q value from the standard chisquare hypothesis test.
Deconstructing Obama Jack Cashill 2011

Goodness of fit between different documents was obtained by computing the so called Q value from the standard chisquare hypothesis test.
Deconstructing Obama Jack Cashill 2011

"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."
Archive 20091001 2009

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.
Archive 20100101 EliRabett 2010

But applying Pearson's chisquare assumes a lot more than that!
New Year's Puzzler EliRabett 2010

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.
New Year's Puzzler EliRabett 2010

By a chisquare test, this has a 99% probability of indicating an increased confusion of flaunt for flout.
Flout good taste; flaunt your excesses « Motivated Grammar 2008

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