chi-square

noun Statistics.

1. a quantity equal to the summation over all variables of the quotient of the square of the difference between the observed and expected values divided by the expected value of the variable.

n.

1. A test statistic that is calculated as the sum of the squares of observed values minus expected values divided by the expected values.

1. A test statistic that is calculated as the sum of the squares of observed values minus expected values divided by the expected values.