Add 2nd edition preface and planned major changes
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rmd_files: [
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"index.Rmd",
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"index.Rmd",
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"preface-2e.Rmd",
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"intro.Rmd",
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"intro.Rmd",
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"explore.Rmd",
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"explore.Rmd",
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# Preface to the second edition {.unnumbered}
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Welcome to the second edition of "R for Data Science".
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## Major changes {.unnumbered}
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- The first part is renamed to "whole game" to reflect the entire data science cycle, including a chapter on data import.
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- In the wrangle part highlight improvements to dplyr that make data scientists' lives even easier, such as new functions for rectangling data, working with list columns, and column-wise and row-wise operations.
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- Data import also gains a whole part that goes beyond importing rectangular data to include chapters on working with spreadsheets, databases, and web scraping.
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- The iteration chapter gains a new case study on web scraping from multiple pages.
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- The modeling part has been removed. For modeling, we recommend using packages from [tidymodels](https://www.tidymodels.org/) and reading [Tidy Modeling with R](https://www.tmwr.org/) by Max Kuhn and Julia Silge to learn more about them.
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## Acknowledgements {.unnumbered}
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*TO DO: Add acknowledgements.*
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