This package was developed for the course of *Building R Packages* from Coursera.

The package features allow you to load and analyze data from US National Highway Traffic Safety Administration's Fatality Analysis Reporting System, which is a nationwide census providing the American public yearly data regarding fatal injuries suffered in motor vehicle traffic crashes.

Data files are `accident_YYYY.csv.bz2`

where *YYYY* is the year in 4 digit format. Data files are in the sub-directory `data`

of `extdata`

.

There are three functions available:

`fars_read_years(years)`

`fars_summarize_years(years)`

`fars_map_state(state.num, year)`

$\texttt{fars_read_years} \qquad \mathit{\text{A function for read one or multiple years}}$

$\mathbf{Description}$

Read one or multiple year from files in the FARS format. It returns a `tibble`

.

$\mathbf{Usage}$

$\texttt{fars_read_years(years)}$

$\mathbf{Arguments}$

$\texttt{years}\qquad$ a vector (atomic or list) of integer(s) representing year in 4 digits format YYYY.

$\mathbf{Examples} \qquad$

Read years 2013 and 2015. Files must be in current directory.

myData <- fars_read_years(c(2013, 2015))

$\texttt{fars_summarize_years} \qquad \mathit{\text{Summarise number of accidents per month and per year(s)}}$

$\mathbf{Description}$

The function calculate from FARS files the number of accidents per month and per year. It permits to compare months year by year.

It returns a `tibble`

with months in row, years in column and counts of accidents as data.

$\mathbf{Usage}$

$\texttt{fars_summarize_years(years)}$

$\mathbf{Arguments}$

$\texttt{years}\qquad$ a vector (atomic or list) of integer(s) representing year in 4 digits format YYYY.

$\mathbf{Examples} \qquad$

Read years 2013 and 2014. Data files must be in current directory.

output <- fars_summarize_years(c(2013,2014)) print(output)

$\texttt{fars_map_state} \qquad \mathit{\text{Draw accidents on a map by year and by state}}$

$\mathbf{Description}$

Draws a map of where the incidents of a given year occurred, based on the data of longitude and latitude present in the FARS data.

The function does not return any value but plot a map.

$\mathbf{Usage}$

$\texttt{fars_map_state(state.num, year)}$

$\mathbf{Arguments}$

$\texttt{state.num}\qquad$ A numeric value with the state number to analyse. Must be present in FARS data

$\texttt{year}\qquad$ A numeric representing the year in 4 digits format YYYY. Must be present in FARS data

$\mathbf{Examples} \qquad$

Plot the accidents of year 2013 in State of Alabama. Data file must be in current directory.

fars_map_state(1,2013)

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