Ladder of powers transformation on a single vector

eda_unipow re-expresses a vector on the ladder of powers and plots the results using a histogram and a density function. Either the Tukey or Box-Cox transformation is used in computing the re-expressed values.

Usage

eda_unipow(
  x,
  p = c(2, 1, 1/2, 0.33, 0, -0.33, -1/2, -1, -2),
  tukey = FALSE,
  base = exp(1),
  bins = 5,
  cex.main = 1.3,
  col = "#DDDDDD",
  border = "#AAAAAA",
  title = "Re-expressed data via ladder of powers",
  ...
)

Arguments

x: Vector
p: Vector of powers
tukey: If TRUE, apply Tukey's power transformation. If FALSE adopt Box-Cox transformation
base: Base used with the log() function if p = 0.
bins: Number of histogram bins
cex.main: Histogram title size (assigned to each histogram plot)
col: Histogram fill color
border: Histogram border color
title: Overall plot title (set to NULL for no title)
...: Other parameters passed to the graphics::hist function.

Value

No return value

Details

The output is a lattice of descriptive plots showing the transformed data across different powers.

References

Tukey, John W. 1977. Exploratory Data Analysis. Addison-Wesley.

Examples

data(mtcars)
eda_unipow(mtcars$mpg, bins=6, tukey = TRUE)