aldvmm.tm: Creating Terms Objects

Description

aldvmm.tm creates a list of up to three "terms" objects, one of the model of component distributions ("beta"), one of the model of probabilities of component membership ("delta") and one for the full model ("full").

Usage

aldvmm.tm(mf, Formula, ncmp, lcoef)

Value

a named list of objects of class "terms".

beta: a "terms" object for the model of component distributions.
delta: a "terms" object of the multinomial logit model of probabilities of component membership.
full: a "terms" object of the full model.

Arguments

mf: a data frame created by model.frame including the variables used in 'formula' supplied to aldvmm plus additional attributes derived from 'formula'.
Formula: an object of class "Formula" created by Formula based on the 'formula' supplied to aldvmm.
ncmp: a numeric value of the number of components that are mixed. The default value is 2. A value of 1 represents a tobit model with a gap between 1 and the maximum value in 'psi'.
lcoef: a character vector of length 2 with labels of objects including regression coefficients of component distributions (default "beta") and coefficients of probabilities of component membership (default "delta").

Details

aldvmm.tm uses terms to create "terms" objects based on a "Formula" object created by Formula and a model frame created by model.frame. The "terms" object for probabilities of group membership is only created if more than one components are specified in 'ncmp'.