**Parent Command**`
> PARAMETER
`

**Subcommand**`
>>> NONE
`

**Description**

This command selects the autoregression coefficient *rho* as the parameter to be adjusted or estimated.
To partially account for time correlations, a first-order autogregressive time series model (AR1) can be applied to the residuals::

Autoregression is performed on the time-series residuals of a data set in block

**Example**`
> PARAMETER
>> REGRESSION
>>> NONE
>>>> VALUE
>>>> INDEX : 1
>>>> RANGE : -1.0 1.0
>>>> VARIATION : 0.1
<<<<
<<<
<<
> OBSERVATION
>> PRESSURE
>>> ELEMENT : A1125
>>>> Read DATA from FILE : pres.col
>>>> standard DEVIATION : 200.0 Pa
>>>> REGRESSION : 0.1
<<<<
<<<
`

**See Also**`
>>>> REGRESSION,
>> SHIFT,
>> DRIFT
`

Page updated: January 4, 2010