Unweighted Sum of Squares Test for Proportions
针对比例检验中期望频数过小的问题，提出一种无加权平方和检验方法，通过降低小频数的权重来替代合并处理，并在计算机记录错误率的实例中表现良好。
The x2 test for proportions (or for independence in a 2 x m contingency table) requires that expected frequencies are not too small. An alternative to amalgamating low frequencies is to retain them but to give them less weight in the analysis. The resulting modified x2 test is also motivated by a likelihood argument based on a random effects model for the true proportions. The test works well in an example concerning error rates in computer records.