Manual Page for Command >>>> SENSITIVITY

**Syntax**

` >>>> SENSITIVITY: (-)`*rsens*

**Parent Command**

`
>>> SELECT`

**Subcommand**

`
-`

**Description**

This command defines one of the criteria used for automatic parameter selection. It examines
the potential of a parameter to reduce the objective function based on the sensitivity coefficient:

dD = |delta S|
where |delta S| is the change of the objective function if the parameter is perturbed by a certain,
small value (see command` >>> PERTURB`).
The sensitivities are normalized to the maximum sensitivity:

omega = dD / dD_{max}
Those parameters with an omega-value larger than |*rsens*|, i.e., the most sensitive parameters, are
selected. Parameters which are unlikely to significantly reduce the objective function are
(temporarily) excluded from the optimization process.
If a negative value is given for *rsens*, the selection criterion is relaxed with each iteration k,
and reaches zero for the last iteration *max_iter*, i.e., all parameters specified in block` > PARAMETER`
are selected for the final step.
*rsens*_{k} = |*rsens*| (1 - k/*max_iter*)
**Example**

> COMPUTATION

>> OPTION

>>> SELECT parameter automatically every

>>>> : 3 ITERATIONS

>>>> based on the SENSITIVITY criterion with *rsens* : -0.10

<<<<

<<<

<<

**See Also**

`
>>>> ITERATION (s) |
>>>> CORRELATION
`

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Page updated: July 29, 1997