Get a feel for the data

Before you analyze return data, it is a good idea to have (at least) a quick look at the data. R has a number of functions that help you do that:

The str() function compactly displays the structure of an R object. It is arguably one of the most useful R functions.
The head() and tail() functions shows you the first and the last part of an R object, respectively.
The class() function shows you the class of an R object.

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