Constructs a list of control parameters to customize the appearance of perspective plots created by <code>plotpersp.cgam</code>.

plotpersp_control

A constrained generalized additive model is fitted by the cgam routine. Given a set of predictors, each of which may have a shape or order restrictions, the maximum likelihood estimator for the constrained generalized additive model is found using an iteratively re-weighted cone projection algorithm. The ShapeSelect routine chooses a subset of predictor variables and describes the component relationships with the response. For each predictor, the user needs only specify a set of possible shape or order restrictions. A model selection method chooses the shapes and orderings of the relationships as well as the variables. The cone information criterion (CIC) is used to select the best combination of variables and shapes. A genetic algorithm may be used when the set of possible models is large. In addition, the cgam routine implements a two-dimensional isotonic regression using warped-plane splines without additivity assumptions. It can also fit a convex or concave regression surface with triangle splines without additivity assumptions. See Liao X, Meyer MC (2019)<doi:10.18637/jss.v089.i05> for more details.

Xiyue Liao

cgam

Constrained Generalized Additive Model

Mary Meyer

plotpersp_control function

Control Parameters for plotpersp.cgam — plotpersp_control

<dl>

 <dt>surface</dt>
<dd>Character string indicating the surface type to plot. Options are <code>"mu"</code> for fitted means or <code>"eta"</code> for systematic component.</dd>

 <dt>x1nm</dt>
<dd>Optional character strings specifying names of the predictors for the x axis.</dd>

 <dt>x2nm</dt>
<dd>Optional character strings specifying names of the predictors for the y axis.</dd>

 <dt>categ</dt>
<dd>Optional character string naming a categorical covariate in the <code>cgam</code> fit to stratify surfaces. Default is <code>NULL</code>.</dd>

 <dt>col</dt>
<dd>Colors used for the surface(s). If <code>NULL</code>, defaults are applied automatically depending on the number of surfaces.</dd>

 <dt>random</dt>
<dd>Logical; if <code>TRUE</code>, colors are randomized for multiple surfaces. Default is <code>FALSE</code>.</dd>

 <dt>ngrid</dt>
<dd>Integer; number of grid points along each axis. Default is <code>12</code>.</dd>

 <dt>xlim, ylim, zlim</dt>
<dd>Optional numeric vectors of length 2 specifying limits for the x, y, and z axes.</dd>

 <dt>xlab, ylab, zlab</dt>
<dd>Axis labels for x, y, and z axes. Default is based on the predictor names and surface type.</dd>

 <dt>th</dt>
<dd>Angle defining the azimuthal direction for viewing the plot (theta).</dd>

 <dt>ltheta</dt>
<dd>Angle defining the direction of lighting (light theta).</dd>

 <dt>main</dt>
<dd>Main title of the plot.</dd>

 <dt>sub</dt>
<dd>Subtitle of the plot.</dd>

 <dt>ticktype</dt>
<dd>Character string indicating type of tick marks: <code>"simple"</code> (default) or <code>"detailed"</code>.</dd>

 </dl>

plotpersp_control: Control Parameters for plotpersp.cgam

Description

Usage

Arguments

Value

See Also

Examples