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A short introduction
to dplyr
Juan Natera
Los Angeles R Meetup
09/04/2014
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A bit about me
• Software Engineer
• Interested in R and its use for gaining
insights about data
• Open Source enthusiast
• Baseball fanatic
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About dplyr
• Developed by Hadley Wickham, Chief
Scientist @ Rstudio.
• Part of a suite of packages meant to
facilitate working on the “data pipeline”.
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Why?
• People spend a lot of time getting data
ready for analysis
• Almost no learning curve (just need to
learn 5 verbs)
• Improves readability
• It's FAST
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The data pipeline
Tidy Transform
Model
Visualize
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The 5 verbs
• flter: remove rows
• select: choose columns
• arrange: reorder rows
• mutate: change data
• summarize: guess...
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No learning curve, how?
• First parameter is always a data.frame
• Other parameters describe what you want
to do with it.
• Always returns a new data.frame
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It's Fast
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Let's see some code!
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A great book I picked up at
useR 2014