In drsmd23/Fars: Summarize motor vehicle crash data

knitr::opts_chunk$set(collapse = T, comment = "#>")
options(tibble.print_min = 4L, tibble.print_max = 4L)
library(readr)
library(dplyr)
library(tidyr)
library(maps)
library(magrittr)
library(Fars)

Fars package overview

The Fars package contains a series of functions that enable the user to quickly load and summarize motor vehicle crash data.

The functions contained within this package are as follows:

• fars_read
• make_filename
• fars_read_years
• fars_summarize_years
• fars_map_state

fars_read

The fars_read function enables users to read motor vehicle crash data from a csv file. The input to the function is the path, name, and extension of the csv file containing the data. The output is a data frame. The examples below use the 2013 and 2014 motor vehicle crash data that is included with this package and can be accessed using the following codes:

• system.file("extdata", "accident_2013.csv.bz2", package = "Fars")
• system.file("extdata", "accident_2014.csv.bz2", package = "Fars").

Examples:

x1 <- system.file("extdata", "accident_2013.csv.bz2", package = "Fars")
y1 <- fars_read(x1)
y1

x2 <- system.file("extdata", "accident_2014.csv.bz2", package = "Fars")
y2 <- fars_read(x2)
y2

make_filename

The make_filename function enables users to generate the csv filename for a particular year of motor vehicle crash data. The input to the function is a year. The output is a file name and extension.

Examples:

x1 <- make_filename(2013)
x1

x2 <- make_filename(2014)
x2

fars_read_years

The fars_read_years function enables users to read motor vehicle crash data from a csv file for a particular year (or list/vector of years). The data must be stored in the current directory. The output is a data frame with only the month and year columns.

Examples:

x1 <- fars_read_years(2013)
x1

x2 <- fars_read_years(c(2013, 2014))
x2

fars_summarize_years

The fars_summarize_years function enables users to read motor vehicle crash data from a csv file for a particular year (or list/vector of years). The data must be stored in the current directory. The output is a data frame with only the month and year columns. The number of motor vehicle crashes are represented with months displayed along the rows and years along the columns.

Examples:

x1 <- fars_summarize_years(2013)
x1

x2 <- fars_summarize_years(c(2013, 2014))
x2

fars_map_state

The fars_map_state function enables users to read motor vehicle crash data from a csv file for a particular year and state number. The data must be stored in the current directory. The output is a graph showing accident locations in a particular year on a map of the user-defined state.

Examples:

fars_map_state(1, 2013)
fars_map_state(48, 2014)

drsmd23/Fars documentation built on May 15, 2019, 2:54 p.m.