Plot of the factorial maps for a correspondence analysis

performs the scatter diagrams of a correspondence analysis.

Usage

# S3 method for class 'coa'
scatter(x, xax = 1, yax = 2, method = 1:3, clab.row = 0.75, 
    clab.col = 1.25, posieig = "top", sub = NULL, csub = 2, ...)

Arguments

x: an object of class coa
xax: the column number for the x-axis
yax: the column number for the y-axis
method: an integer between 1 and 3
1 Rows and columns with the coordinates of lambda variance
2 Columns variance 1 and rows by averaging
3 Rows variance 1 and columns by averaging
clab.row: a character size for the rows
clab.col: a character size for the columns
posieig: if "top", the eigenvalues bar plot is upside; if "bottom", it is downside; if "none", no plot
sub: a string of characters to be inserted as legend
csub: a character size for the legend, used with par("cex")*csub
...: further arguments passed to or from other methods

References

Oksanen, J. (1987) Problems of joint display of species and site scores in correspondence analysis. Vegetatio, 72, 51–57.

Author

Daniel Chessel

Examples

data(housetasks)
w <- dudi.coa(housetasks, scan = FALSE)
if(adegraphicsLoaded()) {
  g1 <- scatter(w, method = 1, psub.text = "1 / Standard", posieig = "none", plot = FALSE)
  g2 <- scatter(w, method = 2, psub.text = "2 / Columns -> averaging -> Rows", 
    posieig = "none", plot = FALSE)
  g3 <- scatter(w, method = 3, psub.text = "3 / Rows -> averaging -> Columns ", 
    posieig = "none", plot = FALSE)
  G <- ADEgS(list(g1, g2, g3), layout = c(2, 2))
  
} else {
  par(mfrow = c(2, 2))
  scatter(w, method = 1, sub = "1 / Standard", posieig = "none")
  scatter(w, method = 2, sub = "2 / Columns -> averaging -> Rows", posieig = "none")
  scatter(w, method = 3, sub = "3 / Rows -> averaging -> Columns ", posieig = "none")
  par(mfrow = c(1, 1))
}
#> Error in s.label(dfxy = w$li, xax = 1, yax = 2, plot = FALSE, storeData = TRUE,     pos = -3, plabels = list(cex = 0.75), xlim = c(-1.78084019584536,     1.2438983366721), ylim = c(-1.22699830497162, 1.79774022754584    ), sub = "1 / Standard"): non convenient selection for dfxy (can not be converted to dataframe)