R: Adding raster representing the fitted effect

l_fitRaster {mgcViz}

R Documentation

Adding raster representing the fitted effect

This layer adds a raster or heat-map representing a fitted multidimensional effect.

l_fitRaster(pTrans = function(.p) 1, noiseup = FALSE, mul = 1, ...)

`pTrans`	a function from (0, 1) to (0, 1) which takes as input a p-value and returns a value, `alpha`, which will be passed on to ggplot2::geom_raster, and will determine the opacity of the heat-map. The p-value quantifies the significance of the smooth effect at each location (x1, x2). By default `pTrans` returns 1, but if we set it to, say, `pTrans = function(.p) .p<0.05` then the regions with p-values higher than 0.05 will disappear. The zto1 function can be used to specify `pTrans` in a flexible way.
`noiseup`	if `TRUE` the fitted effect, mu(x1, x2), will be perturbed with random noise before being plotted. That is, at each location (x1, x2) a random variable z(x1, x2) ~ N(0, mul * V(x1, x2)) will be added to mu(x1, x2). Here V(x1, x2) is the estimated variance of mu(x1, x2) and `mul` is a scalar multiplier (see next argument). This is useful for understanding in which areas the smooth is more uncertain, as these areas will appear more noisy.
`mul`	positive multiplier that scales the variance of the fitted effect. See the `noiseup` argument.
`...`	graphical arguments to be passed to `ggplot2::geom_raster`.

An object of class gamLayer.