Librería Portfolio

In just 24 lessons of one hour or less, Sams Teach Yourself R in 24 Hours helps you learn all the R skills you need to solve a wide spectrum of real-world data analysis problems. You'll master the entire data analysis workflow, learning to build code that's efficient, reproducible, and suitable for sharing with others.


This book's straightforward, step-by-step approach teaches you how to import, manipulate, summarize, model, and plot data with R; formalize your analytical code; and build powerful R packages using current best practices.

Practical, hands-on examples show you how to apply what you learn.
Quizzes and exercises help you test your knowledge and stretch your skills.

Learn How To
Install, configure, and explore the R environment, including RStudio
Use basic R syntax, objects, and packages
Create and manage data structures, including vectors, matrices, and arrays
Understand lists and data frames
Work with dates, times, and factors
Use common R functions, and learn to write your own
Import and export data and connect to databases and spreadsheets
Use the popular tidyr, dplyr and data.table packages
Write more efficient R code with profiling, vectorization, and initialization
Plot data and extend your graphical capabilities with ggplot2 and Lattice graphics
Develop common types of models
Construct high-quality packages, both simple and complex
Write R classes: S3, S4, and Reference Classes
Use R to generate dynamic reports
Build web applications with Shiny
Register your book at informit.com/register for convenient access to updates and corrections as they become available.

This book's source code can be found at http://www.mango-solutions.com/wp/teach-yourself-r-in-24-hours-book/.



Preface xii
HOUR 1: The R Community 1
A Concise History of R 1
The R Community 3
R Development 7
Summary 8
Q&A 8
Workshop 9
Activities 9
HOUR 2: The R Environment 11
Integrated Development Environments 11
R Syntax 14
R Objects 16
Using R Packages 23
Internal Help 28
Summary 29
Q&A 30
Workshop 30
Activities 32
HOUR 3: Single-Mode Data Structures 33
The R Data Types 33
Vectors, Matrices, and Arrays 34
Vectors 35
Matrices 49
Arrays 58
Relationship Between Single-Mode Data Objects 60
Summary 62
Q&A 62
Workshop 63
Activities 64
HOUR 4: Multi-Mode Data Structures 67
Multi-Mode Structures 67
Lists 68
Data Frames 86
Exploring Your Data 93
Summary 98
Q&A 98
Workshop 100
Activities 101
HOUR 5: Dates, Times, and Factors 103
Working with Dates and Times 103
The lubridate Package 107
Working with Categorical Data 108
Summary 112
Q&A 112
Workshop 113
Activities 114
HOUR 6: Common R Utility Functions 115
Using R Functions 115
Functions for Numeric Data 117
Logical Data 121
Missing Data 122
Character Data 123
Summary 125
Q&A 126
Workshop 126
Activities 127
HOUR 7: Writing Functions: Part I 129
The Motivation for Functions 129
Creating a Simple Function 130
The If/Else Structure 136
Summary 146
Q&A 147
Workshop 148
Activities 149
HOUR 8: Writing Functions: Part II 151
Errors and Warnings 151
Checking Inputs 155
The Ellipsis 157
Checking Multivalue Inputs 162
Using Input Definition 164
Summary 168
Q&A 168
Workshop 170
Activities 171
HOUR 9: Loops and Summaries 173
Repetitive Tasks 173
The "applyö Family of Functions 181
The apply Function 183
The lapply Function 195
The sapply Function 204
The tapply Function 208
Summary 213
Q&A 213
Workshop 214
Activities 216
HOUR 10: Importing and Exporting 217
Working with Text Files 217
Relational Databases 223
Working with Microsoft Excel 226
Summary 231
Q&A 232
Workshop 232
Activities 233
HOUR 11: Data Manipulation and Transformation 235
Sorting 236
Appending 237
Merging 238
Duplicate Values 241
Restructuring 242
Data Aggregation 249
Summary 258
Q&A 258
Workshop 259
Activities 259
HOUR 12: Efficient Data Handling in R 261
dplyr: A New Way of Handling Data 261
Efficient Data Handling with data table 273
Summary 282
Q&A 283
Workshop 283
Activities 284
HOUR 13: Graphics 287
Graphics Devices and Colors 287
High-Level Graphics Functions 289
Low-Level Graphics Functions 298
Graphical Parameters 304
Controlling the Layout 305
Summary 308
Q&A 309
Workshop 309
Activities 311
HOUR 14: The ggplot2 Package for Graphics 313
The Philosophy of ggplot2 313
Quick Plots and Basic Control 314
Changing Plot Types 317
Aesthetics 320
Paneling (a k a Faceting) 328
Custom Plots 333
Themes and Layout 338
The ggvis Evolution 342
Summary 342
Q&A 343
Workshop 343
Activities 344
HOUR 15: Lattice Graphics 345
The History of Trellis Graphics 345
The Lattice Package 346
Creating a Simple Lattice Graph 346
Graph Options 356
Multiple Variables 358
Groups of Data 360
Using Panels 362
Controlling Styles 372
Summary 376
Q&A 377
Workshop 378
Activities 378
HOUR 16: Introduction to R Models and Object Orientation 379
Statistical Models in R 379
Simple Linear Models 380
Assessing a Model in R 382
Multiple Linear Regression 391
Interaction Terms 396
Factor Independent Variables 398
Variable Transformations 402
R and Object Orientation 405
Summary 407
Q&A 408
Workshop 408
Activities 409
HOUR 17: Common R Models 411
Generalized Linear Models 411
Nonlinear Models 423
Survival Analysis 430
Time Series Analysis 441
Summary 452
Q&A 452
Workshop 452
Activities 453
HOUR 18: Code Efficiency 455
Determining Efficiency 455
Initialization 458
Vectorization 459
Using Alternative Functions 462
Managing Memory Usage 463
Integrating with C++ 464
Summary 468
Q&A 469
Workshop 469
Activities 470
HOUR 19: Package Building 471
Why Build an R Package? 471
The Structure of an R Package 472
Code Quality 476
Automated Documentation with roxygen2 477
Building a Package with devtools 482
Summary 485
Q&A 485
Workshop 486
Activities 487
HOUR 20: Advanced Package Building 489
Extending R Packages 489
Developing a Test Framework 490
Including Data in Packages 494
Including a User Guide 496
Code Using Rcpp 501
Summary 502
Q&A 502
Workshop 503
Activities 504
HOUR 21: Writing R Classes 505
What Is a Class? 505
Creating a New S3 Class 509
Generic Functions and Methods 511
Inheritance in S3 516
Documenting S3 518
Limitations of S3 518
Summary 519
Q&A 519
Workshop 520
Activities 520
HOUR 22: Formal Class Systems 523
S4 523
Reference Classes 535
R6 Classes 542
Other Class Systems 544
Summary 544
Q&A 545
Workshop 545
Activities 546
HOUR 23: Dynamic Reporting 547
What Is Dynamic Reporting? 547
An Introduction to knitr 548
Simple Reports with RMarkdown 548
Reporting with LaTeX 553
Summary 557
Q&A 558
Workshop 558
Activities 559
HOUR 24: Building Web Applications with Shiny 561
A Simple Shiny Application 561
Reactive Functions 566
Interactive Documents 569
Sharing Shiny Applications 570
Summary 571
Q&A 571
Workshop 571
Activities 572
APPENDIX: Installation 573
Installing