In ykv001/FARSpckgwk4: Week 4 project - Coursera's Building Packages in R

The following functions read, summarize and plot data from the US National Highway Traffic Safety Administration's Fatality Analysis Reporting System (FARS)

Functions

The FARSpckgwk4 package includes the following functions:

• fars_read(filename)
• make_filename(year)
• fars_read_years(years)
• fars_summarize_years(years)
• fars_map_state(state.num, year)

Description and Examples

fars_read(filename)

This function returns a data frame table when the file exists. An error is given if the file doesn't exist. The file has to be located in the present working directory

my_data <- fars_read("accident_2013.csv.bz2")

make_filename(year)

This function creates the FARS file name based in the year covered by the data

my_file <- make_filename(2013)
my_file <- make_filename("2013")

fars_read_years(years)

This function extracts months and years of every FARS file within the years specified. An error is retuned for invalid years specified when the FARS file doesn't exits for that year

my_data <- fars_read_years(c(2013, 2014, 2015))
my_data <- fars_read_years(c("2013", "2014", "2015"))

fars_summarize_years(years)

This functions gives a summary of the fatalities by month for every FARS files read by year

fars_summarize_years(c(2013, 2014))
fars_summarize_years(c("2013", "2014"))

fars_map_state(state.num, year)

This function generates a US state map with the locations of the fatalities for a given year. An error is given if the state number is not present in the data set. If no fatalities present a messages is generated

fars_map_state(10, 2015)
fars_map_state(36, 2014)
fars_map_state(50, 2013)

ykv001/FARSpckgwk4 documentation built on May 6, 2019, 12:05 a.m.