May 2019
Beginner to intermediate
266 pages
5h 57m
English
Content preview from Hands-On Exploratory Data Analysis with R
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t-test in R
This is also referred to as the student's t-test, which is a method for comparing two samples. It can usually be implemented to determine whether the samples are proper or different. This is considered a parametric test, and the data should be distributed normally.
R can handle the various versions of the t-test using the t.test() command.
The following command is used for our longley economic dataset to check the unemployment rate with respect to GNP:
> t.test(longley$GNP, longley$Unemployed)Welch Two Sample t-testdata: longley$GNP and longley$Unemployedt = 2.0045, df = 29.886, p-value = 0.05415alternative hypothesis: true difference in means is not equal to 095 percent confidence interval:-1.297804 138.032179sample estimates: ...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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