The chi-squared test, often written as χ2 test, is a statistical hypothesis test used in the analysis of categorical variables to determine whether observed data are different from expectations. In ...

The normal approximations for the distribution of the Pearson chi-squared statistic permit the size of this bias to be assessed in less-extreme cases involving tables with many cells. These results ...

This article develops a semiparametric, minimum chi-squared estimation method of the proportional hazard model for the case when durations are grouped and covariates are categorical. The proposed ...