StackData {pleLMA}

Prepares data for up-dating association parameters of a multidimensional nominal LMA

Description

Prepares data frame for input to 'mnlogit' for the stacked regression to obtain association parameters of the multidimensional LMA models corresponding to the Nominal item response model. This function is called from 'fit.nominal'. It generally would not run outside of either 'fit.nominal' or 'ple.lma'.

Usage

StackData(
  Master,
  item.log,
  phi.log,
  pq.mat,
  npersons,
  nitems,
  ncat,
  nless,
  ntraits,
  Maxnphi,
  PhiNames,
  LambdaNames
)

Arguments

Master

Master data frame from which stacked data is created

item.log

Last row contains current scale values (item.history)

phi.log

Last row contains current estimates of phi

pq.mat

Summing array to get rest scores and totals

npersons

Number of persons

nitems

Number of items

ncat

Number of categories per item

nless

Number of categories less 1 (i.e., unique lambdas and unique nus)

ntraits

Number of latent traits

Maxnphi

Number of phis to be estimated

PhiNames

Names of the Phi parameters

LambdaNames

Names of lambdas that correspond to those in Master

Value

Phi.mat Up-dated matrix of phi parameters

phi.log History of iterations for LogLike, Lambda and phi parameters