4. Dataframes
Published Online: 6 NOV 2012
DOI: 10.1002/9781118448908.ch4
Copyright © 2013 John Wiley & Sons, Ltd
Book Title
The R Book, Second Edition
Additional Information
How to Cite
Crawley, M. J. (2012) Dataframes, in The R Book, Second Edition, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9781118448908.ch4
Publication History
- Published Online: 6 NOV 2012
- Published Print: 7 DEC 2012
ISBN Information
Print ISBN: 9780470973929
Online ISBN: 9781118448908
- Summary
- Chapter
Keywords:
- dataframes, subscripts and indices;
- selecting rows from the dataframe at random;
- using order and !duplicated, eliminating pseudoreplication;
- complex ordering with mixed directions;
- dataframe creation from another kind of object;
- dataframe, and duplicate row elimination;
- dataframes and dates;
- the match function in dataframes;
- the two dataframe merge;
- dataframe, and adding margins
Summary
This chapter contains sections titled:
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Subscripts and indices
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Selecting rows from the dataframe at random
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Sorting dataframes
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Using logical conditions to select rows from the dataframe
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Omitting rows containing missing values, NA
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Using order and !duplicated to eliminate pseudoreplication
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Complex ordering with mixed directions
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A dataframe with row names instead of row numbers
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Creating a dataframe from another kind of object
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Eliminating duplicate rows from a dataframe
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Dates in dataframes
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Using the match function in dataframes
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Merging two dataframes
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Adding margins to a dataframe
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Summarizing the contents of dataframes