RSModel

reweight.RSModel

estfun.RSModel

character. If "sum" (the default), the first derivatives
    of the elementary symmetric functions are calculated with the sum
    algorithm. Otherwise ("diff") the difference algorithm (faster but
    numerically unstable) is used.

deriv

logical. Should the Hessian of the final model be computed?
    If set to <code>FALSE</code>, the <code>vcov</code> method can only return <code>NA</code>s
    and consequently no standard errors or tests are available in the <code>summary</code>.

hessian

further arguments passed to <code><a href="/link/optim?package=psychotree&version=0.13-0&to=stats" rd-options="stats" data-mini-rdoc="stats::optim">optim</a></code>.

reltol, maxit, ...

<code>RSModel</code> is a wrapper function that creates a <code>"StatModel"</code> object
  with certain fitting parameters passed on to <code><a href="/link/RSModel.fit?package=psychotree&version=0.13-0&to=psychotools" rd-options="psychotools" data-mini-rdoc="psychotools::RSModel.fit">RSModel.fit</a></code> for fitting
  rating scale models.

tree

Recursive partitioning based on psychometric models,
  employing the general MOB algorithm (from package party) to obtain
  Bradley-Terry trees, Rasch trees, Rating scale and partial credit trees.

RSModel: Model-Generating Function for Rating Scale Models

Description

Usage

Arguments

Value

Details

See Also