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)
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).
Value
This function returns the Z score and p-value for the z-test.
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)
#> Proportion Comparison Proportion Z Score
#> 3.355459e-01 2.500000e-01 1.846700e+01
#> p-value
#> 3.782115e-76
