size.ci.mape: Sample size for a mean absolute prediction error confidence...

In statpsych: Statistical Methods for Psychologists

Sample size for a mean absolute prediction error confidence interval

Description

Computes the sample size required to estimate a population mean absolute prediction error for a general linear model with desired confidence interval precision. Setting s = 0 gives the sample size requirement for a mean absolute deviation in a one-group design. This function assumes that the prediction errors have an approximate normal distribution.

Usage

size.ci.mape(alpha, mape, s, w)

Arguments

alpha	alpha value for 1-alpha confidence
mape	mean absolute prediction error planning value
s	number of predictor variables
w	desired confidence interval width

Value

Returns the required sample size

Examples

size.ci.mape(.05, 4.5, 5, 2)

# Should return:
# Sample size
#          57
 

statpsych documentation built on Sept. 11, 2024, 7:42 p.m.