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YaRrr! The Pirate's Guide to R
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![Working with data in a vector, matrix, or data frame [indexing]](http://mercury.webster.edu/aleshunas/R_learning_infrastructure/images/Data%20frame%20in%20RStudio%20environment%20panel.png "Working with data in a vector, matrix, or data frame [indexing]")
Working with data in a vector, matrix, or data frame [indexing]
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dataMeta: Making and appending a data dictionary to an R dataset
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Starting with Data – R for Social Scientists
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R 3.3 - Access or Create Columns in Data Frames, or Simplify a Data Frame using aggregate() - YouTube
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