plotOrdinalFittedVariable: Function that gives the posibility for the user for plotting...

In OrdinalLogisticBiplot: Biplot representations of ordinal variables

Description

Graphical representation of a polytomous ordered variable previously fitted in the reduced space, according to the Ordinal Logistic Biplot theory. It can be choosen some parameters related to the way in which the variable is plotted.

Usage

plotOrdinalFittedVariable(nameVariable, coeffic, D,numFactors, planex = 1, planey = 2,
xi = -3.5, xu = 3.5, yi = -3.5, yu = 3.5, margin = 0,
CexVar = 0.7, ColorVar = "blue",
PchVar = 0.7, addToPlot = FALSE, showIIC = TRUE,
iicxi = -2.5, iicxu = 2.5)

Arguments

nameVariable	Name of the variable the user wants to plot.
coeffic	Vector with the estimated coefficients and the thresholds in this order.
D	Parameter of the graded response model. In case of coefficients have been estimated by Mirt this parameter should be 1.702. In other cases it should be 1.
numFactors	Number of dimensions of the solution
planex	Dimension for X axis.
planey	Dimension for Y axis.
xi	Minimum value on the x-axis.
xu	Maximum value on the x-axis.
yi	Minimum value on the y-axis.
yu	Maximum value on the y-axis.
margin	This value stablishes the space between the plotted items and the border of the window.
CexVar	Size of the category points. It can be an array with the cex information for each variable.
ColorVar	Color for the variables. It can be an array with the color information for each variable.
PchVar	Symbol for the variables. It could be an array with the pch information for each variable.
addToPlot	Boolean parameter to decide if the user wants to add the ordinal variable representation to an existing plot.
showIIC	Boolean parameter to decide if the user wants to see the item information curves for each variable. Default value is FALSE.
iicxi	Lower limit for the X-axis when plotting item information curves.
iicxu	Upper limit for the X-axis when plotting item information curves.

Author(s)

Julio Cesar Hernandez Sanchez, Jose Luis Vicente-Villardon

Maintainer: Julio Cesar Hernandez Sanchez <[e-mail]>

Examples

data(LevelSatPhd)
olbo = OrdinalLogisticBiplot(LevelSatPhd,sFormula=NULL,
      numFactors=2,method="EM",penalization=0.2)
nameVariable="Salary"
coeffic = c(olbo$coefs[1,],olbo$thresholds[1,])
plotOrdinalFittedVariable(nameVariable,coeffic,D=1,numFactors = 2)

OrdinalLogisticBiplot documentation built on May 2, 2019, 3:35 p.m.