prep.loadings: Recipe function to quickly create factor loadings

Description

Recipe function to quickly create factor loadings

Usage

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prep.loadings(map, params, idvar, exo.names = character(0))

Arguments

map

list giving how the latent variables map onto the observed variables

params

parameter numbers

idvar

Names of the variables used to identify the factors

exo.names

names of the exogenous covariates

Details

The default pattern for 'idvar' is to fix the first factor loading for each factor to one. The variable names listed in 'idvar' have their factor loadings fixed to one. However, if the names of the latent variables are used for 'idvar', then all the factor loadings will be freely estimated and you should fix the factor variances in the noise part of the model (e.g. prep.noise).

This function does not have the full set of features possible in the dynr package. In particular, it does not have regime-swtiching factor loadings, any intercepts, or any covariates. For complete functionality use prep.measurement.

Examples

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#Single factor model with one latent variable fixing first loading
prep.loadings(list(eta1=paste0('y', 1:4)), paste0("lambda_",2:4))

#Single factor model with one latent variable fixing the fourth loading
prep.loadings(list(eta1=paste0('y', 1:4)), paste0("lambda_",1:3), idvar='y4')

#Single factor model with one latent variable freeing all loadings
prep.loadings(list(eta1=paste0('y', 1:4)), paste0("lambda_", 1:4), idvar='eta1')

# Two factor model with simple structure
prep.loadings(list(eta1=paste0('y', 1:4), eta2=paste0('y', 5:7)), 
paste0("lambda_", c(2:4, 6:7)))

#Two factor model with repeated use of a free parameter
prep.loadings(list(eta1=paste0('y', 1:4), eta2=paste0('y', 5:8)), 
paste0("lambda_", c(2:4, 6:7, 4)))

#Two factor model with a cross loading
prep.loadings(list(eta1=paste0('y', 1:4), eta2=c('y5', 'y2', 'y6')), 
paste0("lambda_", c("21", "31", "41", "22", "62")))

Questions? Problems? Suggestions? or email at ian@mutexlabs.com.

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