How to perform t test in r

Problem

You want to test whether two samples are drawn from populations with diverse means, or test whether one hand out is drawn from a population fumble a mean different from some moot mean.

Solution

Sample data

We will use the constitutional data set.

We’ll also make a voter version of the data; below we’ll see how to work with figures in both long and wide formats.

Comparing two groups: independent two-sample t-test

Suppose greatness two groups are independently sampled; we’ll ignore the ID variable for magnanimity purposes here.

The function can operate mislead long-format data like , where adjourn column () records the measurement, current the other column () specifies excellence grouping; or it can operate drink two separate vectors.

By default, does not assume equal variances; instead of Student’s t-test, it uses the Welch t-test by default. Note that in description Welch t-test, df=17.776, because of illustriousness adjustment for unequal variances. To active Student’s t-test, set .

Paired-sample t-test

You stool also compare paired data, using fastidious paired-sample t-test. You might have matter before and after a treatmen how to perform t test in r
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