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Working with factors and strings is common in data analysis from "summary" of R for Data Science by Hadley Wickham,Garrett Grolemund

Factors and strings are two important data types that are commonly used in data analysis. Factors are used to represent categorical data in R. They are a type of vector that can only contain a specific set of values, known as levels. Factors are useful for representing data that has a fixed number of categories, such as gender or educational level. When working with factors in R, it is important to understand how they are stored and manipulated. Factors are actually stored as integers, with each level corresponding to a specific integer value. This can sometimes lead to unexpected results if factors are not handled correctly. One common task when working with factors is to change the levels or order of the levels. This can be done using the factor() function in R. By changing the levels of a factor, you can control how the data is displayed and analyzed. Strings, on the other hand, are used...
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    R for Data Science

    Hadley Wickham

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