psychotree: node_regionplot – R documentation

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node_regionplot

Panel-Generating Function for Visualizing Rasch, Rating Scale and Partial Credit Tree Models

Description

Panel-generating function for visualizing the absolute item threshold parameters from the nodes in rasch, rating scale and partial credit tree models.

Usage

node_regionplot(mobobj, names = FALSE, abbreviate = TRUE,
  type = c("mode", "median", "mean"), ref = NULL, ylim = NULL,
  off = 0.1, col_fun = gray.colors, bg = "white", uo_show = TRUE, uo_col = "red",
  uo_lty = 2, uo_lwd = 1.25, ylines = 2)

Arguments

`mobobj`	an object of class `"mob"` based on rasch models fitted by `raschmodel`, rating scale models fitted by `rsmodel` or partial credit models fitted by `pcmodel`.
`names`	logical or character. If `TRUE`, the names of the items are displayed on the x-axis. If `FALSE`, numbers of items are shown. Alternatively a character vector of the same length as the number of items can be supplied.
`abbreviate`	logical. Should item names be abbreviated? If numeric this controls the length of the abbreviation.
`type`	character, specifying which type of threshold parameters are to be used to mark the category regions per item in the plot (see `regionplot` for details).
`ref`	a vector of labels or position indices of item parameters which should be used as restriction/for normalization. If `NULL` (the default), all items are used (sum zero restriction). See `threshpar` for more details.
`ylim`	y axis limits
`off`	numeric, the distance (in scale units) between two item rectangles.
`col_fun`	function. Function to use for creating the color palettes for the rectangles. Per default `gray.colors` is used. Be aware that `col_fun` should accept as first argument an integer specifying the number of colors to create.
`bg`	color for background filling.
`uo_show`	logical. If set to `TRUE` (the default), disordered absolute item threshold parameters are indicated by a horizontal line (only if `type` is set to `"mode"`).
`uo_col`	character, color of indication lines (if `uo_show`).
`uo_lty`	numeric. Line typ of indication lines (if `uo_show`).
`uo_lwd`	numeric. Line width of indication lines (if `uo_show`).
`ylines`	numeric. Number of lines used for y-axis labels.

Details

The panel-generating function node_regionplot is called by the plot method of "rstree" and "pctree" objects by default and does not have to be called by the user directly.

See regionplot for details and references of the drawn region plots and possible values and their meaning for the argument type (taken by node_regionplot).

Prior to version 0.13-1, node_regionplot was called node_effects.

Value

A panel function which can be supplied to the plot method for "mob" objects.

node_regionplot

Description

Usage

Arguments

Details

Value

See Also

psychotree

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