ppg_moe {DisImpact}

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)

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.

Value

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

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)