R

1. An Introduction to R

   Basic objects, vectors, arithmetic, and reading data in R.

2. Objects and Types

   R object types, attributes, vectors, lists, and factors.

3. Evaluation and Environments

   Expression evaluation, environments, scoping, and lazy evaluation.

4. Functions

   Function definitions, argument matching, closures, and return values.

5. Object-Oriented Programming

   S3 and S4 classes, generics, and method dispatch.

6. Indexing and Subsetting

   Subsetting vectors, matrices, lists, and data frames.

7. Data Import and Export

   Reading and writing text, spreadsheet, and database data.

8. Statistical Models

   Model formulae, linear models, and generalized linear models.

9. Graphics

   Plotting functions and graphical parameters.

10. Writing R Packages

    Package structure, DESCRIPTION, documentation, and C/Fortran extensions.

11. Installation and Administration

    Installing R and managing packages and libraries.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

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