An intervally scaled variable whose scores are equal to the product obtained when the values of two other variables are multiplied together. A product variable can be used to incorporate certain types of interaction in multivariate analysis. Skewness is a measure of lack of symmetry of a distribution. When used in analysis of variance or covariance, statistical independence between the independent variables is sometimes referred to as a balanced design. Examples include means, variances, correlation coefficients, and many others.
Statistical measures are different from statistical tests.
Examples include Pearson chi-square, F test, t test, and many others. Statistical tests are different from statistical measures. For analytic purposes, two-point scales can be treated as nominal scales, ordinal scales, or interval scales. In sample surveys weights are most likely to be used with data derived from sample designs having different selection rates or with data having markedly different subgroup response rates.