Make Bertin display of grid data.

One of the most popular ways of displaying grid data has been adopted from Bertin's (1974) graphical proposals, which have had an immense influence onto data visualization. One of the most appealing ideas presented by Bertin is the concept of the reorderable matrix. It is comprised of graphical displays for each cell, allowing to identify structures by eye-balling reordered versions of the data matrix (see Bertin, 1974). In the context of repertory grids, the display is made up of a simple colored rectangle where the color denotes the corresponding score. Bright values correspond to low, dark to high scores. For an example of how to analyze a Bertin display see e.g. Dick (2000) and Raeithel (1998).

Usage

bertin(
  x,
  colors = c("white", "black"),
  showvalues = TRUE,
  xlim = c(0.2, 0.8),
  ylim = c(0, 0.6),
  margins = c(0, 1, 1),
  cex.elements = 0.7,
  cex.constructs = 0.7,
  cex.text = 0.6,
  col.text = NA,
  border = "white",
  lheight = 0.75,
  id = c(T, T),
  cc = 0,
  cr = 0,
  cc.old = 0,
  cr.old = 0,
  col.mark.fill = "#FCF5A4",
  print = TRUE,
  ...
)

Arguments

x

repgrid object.

colors

Vector. Two or more colors defining the color ramp for the bertin (default c("white", "black")).

showvalues

Logical. Whether scores are shown in bertin

xlim

Vector. Left and right limits inner bertin (default c(.2, .8)).

ylim

Vector. Lower and upper limits of inner bertin default(c(.0, .6)).

margins

Vector of length three (default margins=c(0,1,1)). 1st element denotes the left, 2nd the upper and 3rd the right margin in npc coordinates (i.e. 0 to zero).

cex.elements

Numeric. Text size of element labels (default .7).

cex.constructs

Numeric. Text size of construct labels (default .7).

cex.text

Numeric. Text size of scores in bertin cells (default .7).

col.text

Color of scores in bertin (default NA). By default the color of the text is chosen according to the background color. If the background ist bright the text will be black and vice versa. When a color is specified the color is set independent of background.

border

Border color of the bertin cells (default white).

lheight

Line height for constructs.

id

Logical. Whether to print id number for constructs and elements respectively (default c(T,T)).

cc

Numeric. Current column to mark.

cr

Numeric. Current row to mark.

cc.old

Numeric. Column to unmark.

cr.old

Numeric. Row to unmark.

col.mark.fill

Color of marked row or column (default "#FCF5A4").

print

Print whole bertin. If FALSE only current and old row and column are printed.

...

Optional arguments to be passed on to bertinBase.

Value

NULL just for the side effects, i.e. printing.

References

Bertin, J. (1974). Graphische Semiologie: Diagramme, Netze, Karten. Berlin, New York: de Gruyter.

Dick, M. (2000). The Use of Narrative Grid Interviews in Psychological Mobility Research. Forum Qualitative Sozialforschung / Forum: Qualitative Social Research, 1(2).

Raeithel, A. (1998). Kooperative Modellproduktion von Professionellen und Klienten - erlauetert am Beispiel des Repertory Grid. Selbstorganisation, Kooperation, Zeichenprozess: Arbeiten zu einer kulturwissenschaftlichen, anwendungsbezogenen Psychologie (pp. 209-254). Opladen: Westdeutscher Verlag.

Examples

bertin(feixas2004)
bertin(feixas2004, c("white", "darkblue"))

bertin(feixas2004, showvalues = FALSE)

bertin(feixas2004, border = "grey")

bertin(feixas2004, cex.text = .9)

bertin(feixas2004, id = c(FALSE, FALSE))


bertin(feixas2004, cc = 3, cr = 4)


bertin(feixas2004, cc = 3, cr = 4, col.mark.fill = "#e6e6e6")