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R is more than just a statistical programming language. It’s also a powerful tool for all kinds of data processing and manipulation, used by a community of programmers and users, academics, and practitioners. But in order to get the most out of R, you need to know how to access the R Help files and find help from other sources. To represent data in R, you need to be able to succinctly and correctly specify subsets of your data. Finally, R has many functions that allow you to import data from other applications.
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Getting Help with R
Even with good introductory books on R, you’ll need to use the R Help files. The R Help files provide detailed information about the use of different functions and their peculiarities. R has excellent built-in help for every function that explains how to use that function. Just about every Help page has some examples that demonstrate how to use that function.
To search through the Help files, you’ll use one of the following functions:
You aren’t limited to the R Help files if you’re looking for help with R. The add-on package sos, available for download from CRAN here, has some neat functions to search all the Help files on RSiteSearch. It displays results in a web browser window, making it easy to work with.
To use the package sos, you need to install the package by typing install.packages(“sos“) in your R console, and then load the package with library(“sos“).
Then you can use the findFn()function to do your search. For example, by typing findFn(“regression“) into your R console, you get a web page with the names, descriptions and links to several hundred functions that contain the word regression in the function name or Help text description.
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R has many functions that allow you to import data from other applications. The following table lists some of the useful text import functions, what they do, and examples of how to use them.
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In addition to these options to read text data, the package foreign allows you to read data from other popular statistical formats, such as SPSS. To use these functions, you first have to load the built-in foreign package, with the following command:
The following table lists the functions to import data from SPSS, Stata, and SAS.
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