Words: chi-square statistic
Part of speech: n
Definition: A measurement of how expectations compare to results, used in the common chi-squared tests for goodness of fit of an observed distribution to a theoretical one, the independence of two criteria of classification of qualitative data, and in confidence interval estimation for a population standard deviation of a normal distribution from a sample standard deviation.
Example: The chi-square statistic compares the observed count in each table cell to the count which would be expected under the assumption of no association between two or more groups, populations, or criteria.