**Parent Command**`
any third-level command in block > OBSERVATION `

**Subcommand**

none

**Description**

This command sets parameter *lambda* of the Box-Cox transformation.
To address a violation of the homoscedasticity assumption, the Box-Cox transformation can be applied to the measured and simulated
data as follows:

Even though the data of the corresponding simulation result will be transformed, the standard deviation has to refer to the untransformed data; it will be transformed internally to calculate the appropriate weight of the residuals. The Box-Cox transformation parameter can be estimated using command

**Example**`
> OBSERVATION
>> PRESSURE
>>> ELEMENT : A1125
>>>> Read DATA from FILE : pres.col
>>>> standard DEVIATION : 200.0 Pa
>>>> BOX-COX : 0.1
<<<<
<<<
`

**See Also**`
>> BOX-COX,
>>>> LOGARITHM (o)
`

Page updated: January 4, 2010