Is there still a place for Pearson's chi-squared test and Fisher's exact test in surgical research?

摘要

Almost everyone knows of Pearson's chi-squared (%2) test. Karl Pearson described it in 1900,1 although it was another 20 years before RA Fisher demonstrated that Pearson had proposed the wrong degrees of freedom (d.f.) for evaluating the %2 statistic.2 Some may even remember the formula for the statistic:Fisher first described his exact test for 2x2 tables of frequencies in 1925. He used it to analyse a 'thought' experiment that originated in the claim by a colleague, Dr Muriel Bristol, that she could tell by taste whether milk or tea had been added first to a teacup.