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# Transformation

This provides a range of standard transformations for data.

Data | Transformations.

## Available data

This lists variates that can be used for Data and Save In. Double-click a name to copy it into the current input field, alternatively you can just type it in from the keyboard.

## Transformation

A number of standard transformations are available as listed below. The equations use X to represent the data variate, and may involve one or two additional scalar constants, denoted by c and m, values for which must be specified.

## Data

Specifies a variate containing data to be transformed.

 Transformation Genstat Expression Linear m * (X + c) Power (X + c)**m Square root (X + c)**0.5 Log (base 10) log10(X + c) Log (base e) log(X + c) Antilog (base 10) 10**X – c Antilog (base e) exp(X) – c Exponential exp(X + c) Logit log(X / (c – X)) Inverse logit c / (1 + exp(-X)) Double log log(-log(X/c)) Inverse double log c * exp(-exp(X)) Complementary log-log log(-log(1 – (X/c))) Inverse complementary log-log c * (1 – exp(-exp(X))) Accumulation value in unit i of result is the sum of the first i units of X Differencing value in unit i of result is set to xi − xi-c

## Save in

Specifies a data structure to contain the transformed values.

## Parameters in equation

Lets you specify values for the additional constants, m and c, as appropriate.