Analysis of Variance (ANOVA) Introduction When hypothesis testing is performed in clinical research, the data embedded into each sample corresponds to a specific sample. If there are one or two treatments, then use t-tests to analyze the effectiveness of the treatments. If there are more than two treatments, then the use of analysis of variance (ANOVA) is applied to determine the effectiveness of treatments.

Analysis of Variance The tests discussed so far are appropriate when making only one comparison, whether it is a comparison of two populations, a sample taken from a population, or a comparison of two samples to each other. However, most studies or experiments are designed to compare more than two samples, populations, or treatments. Comparing more than two samples requires the use...