R Data Frame: How to Create, Append, Select & Subset
![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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