BiplotMain {DASplusR}R Documentation

Main Dialog for the Biplot

Description

Main dialog for creating a biplot. The function biplotDAS is executed to produce the plot when the OK button is clicked.

Usage

## DAS+R GUI:
Check the 'Biplot' checkbox in the PCA or FA dialog, or 
use 'Advanced --> Biplot' in the DAS+R menu and select 
an object.

## R Function Usage:
BiplotMain(objName)

Arguments

objName The name of an object of class "princomp" or "factanal" as a character string.

Dialog Elements

Title:
Entry field for the plot title.
Details:
Clicking this radiobutton opens a dialog for specifying further details on the plot title and the axis labels.
Variables:
Select the x- and y-variable from the corresponding listboxes. Note that the same component or factor cannot be used for both variables.
Scores Details:
The observations are represented by a scatterplot of the scores, which allows the following options to be set:
Color:
A color from the currently used color menu can be selected from the the drop-down list. Alternatively, the Select Color dialog can be opened by clicking the radiobutton on the right, and the color for the scores can be selected there. The box around the plot area is drawn in the same color as the scores.
Symbol:
In very much the same manner, the symbol to represent the scores in the scatterplot can be selected. The drop-down list contains all symbols of the currently used symbol set. Either choose a symbol from the drop-down list, or open the Select Symbol dialog by clicking the radiobutton on the right, and select the symbol there. The only difference from selecting a color is that the drop-down list also contains the element <ID>. Data sets of class "DASData" usually have one column containing the sample identifications. In this case, these identifications are used to label the scores. If the active data set is of class "data.frame" or does not have such a column, the row names are used as labels. By default, the row names contain the observation numbers.
Symbol Size:
Entry field for the symbol size.
Loadings Details:
The variables that have been entered into PCA or FA are represented by a scatterplot of their loadings. Hence the variable names are used as labels here. In addition, arrows are drawn. These are very useful for interpreting the plot. The length of an arrow is directly proportional to the variability of the corresponding variable included in the two components or factors, and the angle between any two arrows is a measure for the correlation between these variables. The following options can be set:
Color:
The color for the labels and arrows (and the tickmarks of the axes belonging to the loadings) can be selected like the color for the scores.
Label Length:
Enter the maximum number of characters of the variable names to be used for labeling the loadings. Longer names will be truncated.
Label Size:
Entry field for the size of the labels.
Arrow Head Length:
The length of the arrow heads can be adjusted using this entry field. If 0 is entered, no arrow heads are plotted.
Default:
Resets all the dialog elements to their default values.
OK:
Closes the dialog and executes biplotDAS to produce the plot.
Cancel:
Closes the dialog without executing biplotDAS.
Help:
Shows this help file.

Side Effects

A plot is produced on the current graphics device.

Author(s)

Andreas Alfons <andreas.alfons@student.tuwien.ac.at>

References

Gabriel, K.R. (1971) The biplot graphical display of matrices with application to principal component analysis. Biometrika, 58, 453–467.

Reimann, C., Filzmoser, P., Garrett, R.G. and Dutter, R. (2008) Statistical Data Analysis Explained. Wiley & Sons.

See Also

biplotDAS, BiplotGUI, BiplotDetails, PrincompGUI, ScreeplotGUI, FactanalGUI, FactplotGUI.


[Package DASplusR version 0.0-1 Index]