persp.qdm: Perspective Plot for Predictions of Quadrilateral...
In qdm: Fitting a Quadrilateral Dissimilarity Model to Same-Different Judgments

Draws a perspective plot of the predictions of a Quadrilateral Dissimilarity Model fitted with qdm.

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## S3 method for class 'qdm'
persp(x, col = "gray", zlim = 0:1, phi = 10, theta = -25,
      xlab = "OA1", ylab = "OA2", zlab = "Predictions", ...)

`x`	object of class 'qdm'. See `qdm`.
`col`	the color(s) of the surface facets. Transparent colours are ignored. This is recycled to the (nx-1)(ny-1) facets.
`zlim`	Defaults to zlim=c(0,1) since probabilities are plotted.
`theta, phi`	angles defining the viewing direction. 'theta' gives the azimuthal direction and 'phi' the colatitude.
`xlab, ylab, zlab`	titles for the axes. N.B. These must be character strings; expressions are not accepted. Numbers will be coerced to character strings.
`...`	additional graphical parameters (see 'par').