ISCAM (version 1.0.0)

iscamtwopropztest: Two Proportion Z-Test and Interval

Description

iscamtwopropztest calculates a two-proportion z-test and/or a corresponding confidence interval.

Usage

iscamtwopropztest(
  observed1,
  n1,
  observed2,
  n2,
  hypothesized = 0,
  alternative = NULL,
  conf.level = NULL,
  datatable = NULL,
  verbose = TRUE
)

Value

This function prints the results of the two-proportion z-test and/or the confidence interval. It also generates plots to visualize the test and interval.

Arguments

observed1

The observed number of successes in group 1. If a value less than 1 is provided, it is assumed to be the sample proportion.

n1

The sample size for group 1.

observed2

The observed number of successes in group 2. If a value less than 1 is provided, it is assumed to be the sample proportion.

n2

The sample size for group 2.

hypothesized

The hypothesized difference in probability of success under the null hypothesis. This is an optional parameter.

alternative

A character string specifying the form of the alternative hypothesis. Must be one of "less", "greater", or "two.sided". This is an optional parameter.

conf.level

The confidence level(s) for a two-sided confidence interval. This is an optional parameter.

datatable

A two-way table of counts as an alternative input method. This is an optional parameter.

verbose

Logical, defaults to TRUE. Set to FALSE to suppress messages

Examples

iscamtwopropztest(observed1 = 35, n1 = 50, observed2 = 28, n2 = 45)

iscamtwopropztest(
  observed1 = 0.8,
  n1 = 100,
  observed2 = 0.6,
  n2 = 80,
  hypothesized = 0,
  alternative = "greater",
  conf.level = 0.95
)

iscamtwopropztest(observed1 = 60, n1 = 100, observed2 = 45, n2 = 90, conf.level = 0.90)