Michael Kubovy wrote:
Suppose we start with
data("Titanic")
mosaic(Titanic, shade = TRUE)
How do I combine the dashed box contours of shading_Friendly to indicate negative
residuals, with three levels of gray: dark for abs(Pearson Resid) > 4, lighter for 4
> abs(Pearson Resid) > 2, and lightest for bs(Pearson Resid) < 2 ?
Do you mean [1] you want to plot positive residuals in color and
negative in gray scale?
Or [2] to fold + and - residuals by shading all according to abs(resid), and
distinguishing + from - by the dashed box outlines?
In fact, I designed this coding scheme so that mosaic plots in color
(with my blue - white - red scheme) would approximately do exactly what
you might want under [2], when rendered in B/W, since the fully
saturated red and blue are close in darkness in B/W.
Try
mosaic(Titanic, gp=shading_Friendly)
save as a jpg/png and try converting to B/W with an image program and
see if this is good enough.
Alternatively, write your own, shading_Kubovy, modeled on
shading_Friendly <-
function (observed = NULL, residuals = NULL, expected = NULL,
df = NULL, h = c(2/3, 0), lty = 1:2, interpolate = c(2, 4),
eps = 0.01, line_col = "black", ...)
{
shading_hsv(observed = NULL, residuals = NULL, expected = NULL,
df = NULL, h = h, v = 1, lty = lty, interpolate = interpolate,
eps = eps, line_col = line_col, p.value = NA, ...)
}
<environment: namespace:vcd>
attr(,"class")
[1] "grapcon_generator"
In the defaults, lty=1:2 is what distinguishes + and - for outline line type
hope this helps,
-Michael
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