prefpls function

Scatter plot and additional variables with quality of representation contour lines

This function is useful to interpret the usual graphs $(x,y)$ with additional quantitative variables.

prefpls(donnee, var1 = 1, var2 = 2, firstvar = 3, 
    lastvar = ncol(donnee), levels = c(0.2,0.4,0.6,0.7,0.8,0.9,1), 
    asp = 1, nbchar = max(nchar(colnames(donnee))), title = NULL,
    choix="var")

Arguments

• donnee: a data frame made up of quantitative variables
• var1: the position of the variable corresponding to the x-axis
• var2: the position of the variable corresponding to the y-axis
• firstvar: the position of the first endogenous variable
• lastvar: the position of the last endogenous variable (by default the last column of donnee)
• levels: a list of the levels displayed in the graph of variables
• asp: aspect ratio for the graph of the individuals
• nbchar: the number of characters used for the labels of the variables
• title: string corresponding to the title of the graph you draw (by default NULL and a title is chosen)
• choix: the graph to plot ("ind" for the individuals, "var" for the variables)

Details

This function is very useful when there is a strong correlation between two variables x and y

Returns

A scatter plot of the invividuals

A graph with additional variables and the quality of representation contour lines.

References

Husson, F. & Pages, J. (2005). Scatter plot and additional variables. Journal of applied statistics

Author(s)

Francois Husson francois.husson@institut-agro.fr

Examples

data(decathlon)
prefpls(decathlon[,c(11,12,1:10)])