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Ladder of powers transformation on a single vector

Source: R/eda_unipow.R
eda_unipow.Rd

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,
  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

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)