dcm.design.effcy: INTERNAL: Calculate design efficiencies

In choiceDes: Design Functions for Choice Studies

Description

Internal function to calculate mathematical efficiencies of designs.

Usage

dcm.design.effcy(des)

Arguments

des	An effects-coded design to be evaluated.

Details

Calculates overall D-efficiency, the variance-covariance matrix, and standard deviations for each parameter from an effects coded design.

Called internally by dcm.design and dcm.design.cand.

Value

D	Overall D-efficiency: det(M)^(-1/k), where det(M) is the determinant of the dispersion matrix X'X, and k is the number of parameters.
V	Variance-covariance matrix derived from M.
s	Parameter standard deviations: sqrt(diag(V)).

See Also

dcm.design, dcm.design.cand

Examples

des <- dcm.design(c(3,3,4,3), 10, 8, 3)$effects$design
eff <- dcm.design.effcy(des)

Example output

Loading required package: AlgDesign
dcm.design 0.9-0,  Tue Nov  7 04:32:36 2017 
parameters: 9, D-efficiency: 0.008178343
time elapsed: 0.341238 secs

choiceDes documentation built on May 2, 2019, 1:28 p.m.