negloglik_glf

vector of regression coefficients,
and <code>M</code>,  <code>B</code>, <code>T</code>, (offset, slope and symmetry of the g function)

vector of standardized scores from the continuous ordinal scale

d.matrix

length of the regression coefficients vector

len_beta


Log-likelihood function for the fixed-effects model


likelihood

log-likelihood.

A regression framework for response variables which are continuous self-rating scales such as the Visual Analog Scale (VAS) used in pain assessment, or the Linear Analog Self-Assessment (LASA) scales in quality of life studies. These scales  measure subjects' perception of an intangible quantity, and cannot be handled as ratio variables because of their inherent nonlinearity. We treat them as ordinal variables, measured on a continuous scale. A function (the g function, currently the generalized logistic function) connects the scale with an underlying continuous latent  variable.  The link function is the inverse of the CDF of the assumed underlying distribution of the latent variable. Currently the logit link, which corresponds to a standard logistic distribution, is implemented.

negloglik_glf: Log-likelihood function for the fixed-effects model

Description

Usage

Arguments

Value

Details