logistic_tform: Logistic function to help set alpha opacity

In cheem: Interactively Explore Local Explanations with the Radial Tour

Logistic function to help set alpha opacity

Description

Suggests a alpha opacity to plot with as a function of the number of observation.

Usage

logistic_tform(n, mid_pt = 600, k_attenuation = 5, ceiling = 1, floor = 0.3)

Arguments

n	Number of observations to plot.
mid_pt	Inflection point that the logistic curve. Defaults to 600.
k_attenuation	The steepness of the transition, larger is a sharper transition. Quite sensitive and defaults to 5.
ceiling	The highest number returned. Defaults to 1.
floor	The lowest number returned. Defaults to 0.3.

Value

A scalar numeric, suggested value to set alpha opacity.

See Also

Other cheem utility: as_logical_index(), color_scale_of(), contains_nonnumeric(), is_discrete(), is_diverging(), linear_tform(), problem_type(), rnorm_from(), sug_basis(), sug_manip_var()

Examples

library(cheem)

## Suggest an opacity to use in plotting:
(my_alpha <- logistic_tform(nrow(spinifex::penguins_na.rm)))

## Visualize
x <- 1:2000
plot(x, logistic_tform(x), col = "blue")

cheem documentation built on Nov. 9, 2023, 1:08 a.m.