Read downloaded data from US National Highway Traffic Safety Administration's Fatality Analysis Reporting System and delivers a summary with number of entries per year and month.
A list of wanted years in the format yyyy (four digits)
A data frame, with the number of entries for the matching year (columns) and month (rows).
If the file for a year is not found, a warning will be issued and there will be no column for the year.
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## Not run: fars_summarize_years(2012:2015) ## End(Not run)
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