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Minor typo fix (#187) 

Fix misspelling of "rectangular".
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Christian G. Warden 2016-07-26 05:42:30 -07:00 committed by Hadley Wickham
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@ -77,7 +77,7 @@ However, we strongly believe that it's best to master one tool at a time. You wi
### Non-rectangular data
This book focuses exclusively on rectangular data: collections of values that are each associated with a variable and an observation. There are lots of datasets that do not naturally fit in this paradigm: images, sounds, trees, text. But reactangular data frames are extremely common in science and in industry and we believe that they're a great place to start your data science journey.
This book focuses exclusively on rectangular data: collections of values that are each associated with a variable and an observation. There are lots of datasets that do not naturally fit in this paradigm: images, sounds, trees, text. But rectangular data frames are extremely common in science and in industry and we believe that they're a great place to start your data science journey.
### Hypothesis confirmation