Merge branch 'master' of github.com:hadley/r4ds

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hadley 2016-06-20 08:31:23 -05:00
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### Exercises
1. What variables in `heights` do you expect to be most highly correlated with
income? Use `cor()` plus `purr::map_dbl()` to check your guesses.
income? Use `cor()` plus `purrr::map_dbl()` to check your guesses.
1. Correlation only summarises the linear relationship between two continuous
variables. There are some famous drawbacks to the correlation. What