probit Scale (GPL)

Syntax

probit(dim(<numeric>), <function>)

or 

probit(aesthetic(aesthetic.<aesthetic type>), <function>)

<numeric>. A numeric value indicating the dimension to which the scale applies. See the topic dim Function (GPL) for more information.

<function>. One or more valid functions.

<aesthetic type>. An aesthetic type indicating the aesthetic to which the scale applies. This is an aesthetic created as the result of an aesthetic function (such as size) in the ELEMENT statement.

Description

Creates a probit scale. The formula for the transformation is the inverse cumulative distribution function (CDF) of the normal distribution. Data values for this scale must fall in the closed interval [0, 1]. That is, for any data value x, 0 ≤ x ≤ 1.

Note that probit(dim(<numeric>)) is equivalent to prob(dim(<numeric>), prob(normal(0, 1)).

Example

Figure 1. Example: Specifying a probit scale
probit(dim(2))