vannstats (version 1.5.4.07)

z.test: Simplified Z Tests

Description

This function runs a one-sample Z-test, comparing the proportion in your sample to the proportion in the population.

Usage

z.test(df, var1, var2, prop)

Value

This function returns the Z score and p-value for the z-test.

Arguments

df

data frame to read in.

var1

variable with the total number of events, by sub-unit (e.g. cities within a county).

var2

variable with number of events for a specific group.

prop

proportion to compare to (between 0 and 1).

Examples

data <- UCR2015[UCR2015$state=="California",]
data$total_part2 <- data$burglary + data$larceny + data$mv_theft + data$arson

z.test(data,total_part2,burglary,.25)