May 2019
Beginner to intermediate
266 pages
5h 57m
English
Content preview from Hands-On Exploratory Data Analysis with R
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Directional hypothesis in R
In this hypothesis testing, you can only specify a direction to the dataset mentioned previously. Here, we will use the same function with the alternative equal to (=) instruction to switch the emphasis from a two-sided test (the default) to a one-sided test. The choices that we have are two.sided, less, or greater, and the choice can be abbreviated, as shown in the following command:
> t.test(Autompg$displacement, mu = 5, alternative = 'greater') One Sample t-testdata: Autompg$displacementt = 36.052, df = 397, p-value < 2.2e-16alternative hypothesis: true mean is greater than 595 percent confidence interval: 184.8088 Infsample estimates:mean of x 193.4259 > t.test(Autompg$displacement, mu = 5, alternative = 'two.sided') ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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