Use Mood’s Median Test
when you have one categorical factor and a continuous response, and you are confident that the data for all of the groups have similarly shaped distributions. Using this test, you can do the following:
- Determine whether the medians of two or more groups differ.
- Calculate a range of values that is likely to include the difference between population medians.
For example, a researcher wants to determine whether the presentation method that a teacher uses affects students' comprehension of the lecture. The researcher selects 149 students and randomly assigns them to lectures that use one of three different presentation methods: text descriptions, photographs, or cartoons.
Where to find this analysis
When to use an alternate analysis
- If the distributions of the groups do not include outliers, use Kruskal-Wallis Test because it has more power.
- If you have a randomized block design and want to test the medians, use Friedman Test.