This article describes in detail what is a chi-square test, on which type of data it is used, the assumptions associated with its application, how to manually calculate it and how to make use of an online calculator for calculating the Chi-square statistics and its associated P-value. Chi-square test and the logic of hypothesis testing were developed by Karl Pearson. More specifically, this statistic can be used to determine whether there is any difference between the study groups in the proportions of the risk factor of interest. The chi-square test statistic can be used to evaluate whether there is an association between the rows and columns in a contingency table. These counts are commonly arranged in a tabular format known as a contingency table. In medical research, there are studies which often collect data on categorical variables that can be summarized as a series of counts.
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