You’ve now learned about numeric values, logicals, character strings, and factors, as well as their unique properties and applications. Now you’ll look at some special values in R that aren’t as well-defined. You’ll see how they might come about and how to handle and test for them. Then you’ll look at different data types in R and some general object class concepts.

6.1 Some Special Values

Many situations in R call for special values. For example, when a data set has missing observations or when a practically infinite number is calculated, the software has some unique terms that it reserves for these situations. ...

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