backPain

Data from a study of patients suffering from back pain. Prognostic
 variables were recorded at presentation and progress was categorised
 three weeks after treatment.

datasets

An implementation of about 6 major classes of
statistical regression models. The central algorithm is
Fisher scoring and iterative reweighted least squares.
At the heart of this package are the vector generalized linear
and additive model (VGLM/VGAM) classes. VGLMs can be loosely
thought of as multivariate GLMs. VGAMs are data-driven
VGLMs that use smoothing. The book "Vector Generalized
Linear and Additive Models: With an Implementation in R"
(Yee, 2015) <DOI:10.1007/978-1-4939-2818-7> gives details of
the statistical framework and the package. Currently only
fixed-effects models are implemented. Many (150+) models and
distributions are estimated by maximum likelihood estimation
(MLE) or penalized MLE. The other classes are RR-VGLMs
(reduced-rank VGLMs), quadratic RR-VGLMs, reduced-rank VGAMs,
RCIMs (row-column interaction models)---these classes perform
constrained and unconstrained quadratic ordination (CQO/UQO)
models in ecology, as well as constrained additive ordination
(CAO). Note that these functions are subject to change;
see the NEWS and ChangeLog files for latest changes.

Thomas Yee

VGAM

Vector Generalized Linear and Additive Models

backPain function

A data frame with 101 observations on the following 4 variables.<dl class="dl-horizontal">
 <dt>x1</dt><dd>length of previous attack.</dd>
 <dt>x2</dt><dd>pain change.</dd>
 <dt>x3</dt><dd>lordosis.</dd>
 <dt>pain</dt><dd>an ordered factor describing the progress of each
 patient with levels <code>worse</code> &lt; <code>same</code> &lt;
 <code>slight.improvement</code> &lt; <code>moderate.improvement</code> &lt;
 <code>marked.improvement</code> &lt; <code>complete.relief</code>.</dd>
 </dl>

Format

Data on Back Pain Prognosis, from Anderson (1984) — backPain

A data frame with 101 observations on the following 4 variables.<dl class='dl-horizontal'>
 <dt>x1</dt><dd>length of previous attack.</dd>
 <dt>x2</dt><dd>pain change.</dd>
 <dt>x3</dt><dd>lordosis.</dd>
 <dt>pain</dt><dd>an ordered factor describing the progress of each
 patient with levels <code>worse</code> &lt; <code>same</code> &lt;
 <code>slight.improvement</code> &lt; <code>moderate.improvement</code> &lt;
 <code>marked.improvement</code> &lt; <code>complete.relief</code>.</dd>
 </dl>

backPain: Data on Back Pain Prognosis, from Anderson (1984)

Description

Usage

Arguments

Format

References

Examples