In codyschulz/samplePackage2: Read and Summarize FARS Data

This vignette describes the R package 'samplePackage2'. The package can read in, summarize, and map 2013-2015 motor vehicle accident data from the US National Highway Traffic Safety Administration's Fatality Analysis Reporting System (FARS).

Reading in Data

samplePackage2 has several ways to read in data. The first is to use fars_read() and make_filename() in conjunction. For example, to read in data from 2013, use:

library(samplePackage2)
fars_read(make_filename(2013))

To read in multiple years of data, supply a vector of years to fars_read_years:

fars_read_years(c(2013, 2014, 2015))

Notice that the output of the first call was a single data frame, but the output of the second was a list of data frames.

Summarizing Data

To use the package's built-in summarizing functions, simply call fars_summarize_years with a vector of years whose summary is desired. fars_summarize_years returns a data table with the number of accidents per month occurring in the years given.

fars_summarize_years(c(2013, 2014))

Mapping Data

To use the package's built-in mapping functions, provide fars_map_state with a year and state number. The function will then output a plot of each accident in that state in the given year. The state number corresponds to the alphabetized listing of states (1 = Alabama, 56 = Wyoming).