fars_summarize_years: Summarize the content of multiple FARS data files
In dmendres/farsAssignment:

Description Usage Arguments Details Value Examples

This function produces a summary data.frame containing the number of reports by month for the FARS files corresponding to each year in the years list.

1	fars_summarize_years(years)

years

A list of 4-digit year numbers (YYYY) specifying the FARS files to be read.

Missing years will be skipped with a warning.

The following functions are imported: dplr::bind_rows, dplr::group_by, dply::summarize, and tidyr::spread

This function returns a data.frame of 12 observations, one each month, of the number FARS reports in the specified years.

fars_summarize_years(list(2013, 2014, 2015))
# will produce a warning
#fars_summarize_years(list(2013,2016))
# will fail
#not run, will fail: fars_summarize_years(1999)