摘要：Pearson's statistic is investigated for nominal-ordinal two-way contingency tables in
which we wish to test for identical rows. The statistic is expressed as a sum, the first summand of
which is a statistic given by Yates (1948), and examines location effects for the nominal category.
The second and subsequent summands reflect the corresponding moments: for example, dispersion,
skewness, kurtosis etc. The summands are shown to be weakly optimal in that they are score statistics.
