cs_combine: Ensure Objects Contain Data Only For a Given Year

In chris-prener/compStatR: Tools for St. Louis Crime Data

Ensure Objects Contain Data Only For a Given Year

Description

Since crimes are sometimes reported well after they are committed, objects created with cs_collapse often contain crimes that occurred in prior years. The cs_combine function ensures that objects contain only data for a given year, with the ability to add in crimes reported for the given year in later years.

Usage

cs_combine(type = "year", date, ...)

Arguments

type	"year" is the only valid input currently; year to date functionality is planned for a later update
date	For type = "year", this should be the year of data to be returned. For type = "ytd", this should be the last month to be included in each estimate.
...	An unquoted list of objects

Details

When applied to a single year's worth of data, cs_combine will subset out any crimes that occured in a year other than the one given for the date argument.

When applied to a range of objects, such as objects for 2017 and 2018, each object will be subset to identify crimes that occured in the year given for the date argument. This creates a more complete accounting of crime in a given year since it adds in crimes reported in subsequent years to the object. At the same time, crimes that occured prior to the given year will also be subset out to ensure the resulting object only contains crimes that occured in that given year.

Value

A tibble containing a selection of combined crime data for a given time period.

Examples

# load example year-list objects
load(system.file("testdata", "yearList17.rda", package = "compstatr", mustWork = TRUE))
load(system.file("testdata", "yearList18.rda", package = "compstatr", mustWork = TRUE))

# validate
cs_validate(yearList17, year = 2017)
cs_validate(yearList18, year = 2018)

# standaridze May for the 2017 object, which has 26 variables
yearList17 <- cs_standardize(yearList17, month = "May", config = 26)

# validate again to confirm fix
cs_validate(yearList17, year = 2017)

# collapse now that the data are valid
crimeReports17 <- cs_collapse(yearList17)
crimeReports18 <- cs_collapse(yearList18)

# combine to add all sample 2017 crimes reported in 2018 to a single 2017 object
# and remove from our 2017 object all sample crimes reported in 2017 that occured prior
# to that year
crime17 <- cs_combine(type = "year", date = 2017, crimeReports17, crimeReports18)

chris-prener/compStatR documentation built on Jan. 25, 2024, 10:03 p.m.