March 2019
Beginner to intermediate
448 pages
13h 14m
English
Content preview from R Statistics Cookbook
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How to do it...
In this example, we will load a dataset containing heights for 199 individuals divided into two samples (100 and 99). Each sample is obtained in a different area. We want to know whether the two mean heights for the two samples are equal or not. It's worth noting that we don't need the sample sizes to be the same:
- First, we need to load dplyr and read the dataset. This contains two columns: Sample (either 1 or 2) and Height (numeric variable). To check whether the variances are equal, we first do LeveneTest (its null hypothesis is that the variances are the same). Note that we pass a formula to this function, because it expects variable ~ group (where group should be a factor indicating to which sample each observation belongs). ...
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