DisImpact (version 0.0.21)

ppg_moe: Margin of error for the PPG

Description

Calculate the margin of error (MOE) for the percentage point gap (PPG) method.

Usage

ppg_moe(n, proportion, min_moe = 0.03, prop_sub_0 = 0.5, prop_sub_1 = 0.5)

Value

The margin of error for the PPG given the specified sample size.

Arguments

n

Sample size for the group of interest.

proportion

(Optional) The proportion of successes for the group of interest. If specified, then the proportion is used in the MOE formula. Otherwise, a default proportion of 0.50 is used (conservative and yields the maximum MOE).

min_moe

The minimum MOE returned even if the sample size is large. Defaults to 0.03. This equates to a minimum threshold gap for declaring disproportionate impact.

prop_sub_0

For cases where `proportion` is 0, substitute with prop_sub_0 (defaults to 0.5) to account for the zero MOE.

prop_sub_1

For cases where `proportion` is 1, substitute with prop_sub_1 (defaults to 0.5) to account for the zero MOE.

References

California Community Colleges Chancellor's Office (2017). Percentage Point Gap Method.

Examples

ppg_moe(n=800)
ppg_moe(n=c(200, 800, 1000, 2000))
ppg_moe(n=800, proportion=0.20)
ppg_moe(n=800, proportion=0.20, min_moe=0)
ppg_moe(n=c(200, 800, 1000, 2000), min_moe=0.01)