calculate_a_error {spdesign}

A-error

Description

Computes the A-error of the design, which is equal to the trace of the variance-covariance matrix over the number of parameters to be estimated

Usage

calculate_a_error(design_vcov)

Arguments

design_vcov

A variance-covariance matrix returned by derive_vcov or returned by an estimation routine. The matrix should be symmetrical and K-by-K

Value

A single error measure