Data assets used in these examples
* Titanic [https://www.kaggle.com/c/titanic]
* City population
[http://ezlocal.com/blog/post/Top-5000-US-Cities-by-Population.aspx]
* USGS ShakeMap Atlas [https://earthquake.usgs.gov/data/shakemap/]
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Reading data from CSV files
Reading CSV files and using one of the columns