# symbox

0th

Percentile

##### Boxplots for transformations to symmetry

symbox first transforms x to each of a series of selected powers, with each transformation standardized to mean 0 and standard deviation 1. The results are then displayed side-by-side in boxplots, permiting a visual assessment of which power makes the distribution reasonably symmetric.

Keywords
hplot
##### Usage
symbox(x, powers=c(-1, -.5, 0, .5, 1), start=0)
##### Arguments
x
a numeric vector.
powers
a vector of selected powers to which x is to be raised. A power of 0 is taken to mean $log(x)$. Negative powers are taken to mean $-x^p$, to preserve the order of the data. For meaningful comparison of powers, 1 s
start
a constant to be added to x; after adding the start, all data values must be positive.
##### Value

• as returned by boxplot.

##### References

Friendly, M. (2005) SAS System for Statistical Graphics, 2nd Edition. SAS Institute (In preparation).

##### See Also

boxplot, boxcox, box.cox

• symbox
##### Examples
symbox(Prestige\$income)
Documentation reproduced from package car, version 1.2-16, License: GPL (>= 2)

### Community examples

Looks like there are no examples yet.