.. _variables-lognormal_uncertain-parameters:

""""""""""
parameters
""""""""""


Select a parmaterization of the lognormal distribution



.. toctree::
   :hidden:
   :maxdepth: 1

   variables-lognormal_uncertain-parameters-option_1
   variables-lognormal_uncertain-parameters-option_2
   variables-lognormal_uncertain-parameters-option_3


**Specification**

- *Alias:* None

- *Arguments:* None


**Child Keywords:**

+-------------------------+--------------------+--------------------+-----------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword     | Dakota Keyword Description                    |
|                         | Group              |                    |                                               |
+=========================+====================+====================+===============================================+
| Required (Choose One)   | Lognormal          | `option_1`__       | Specify means and standard deviations for the |
|                         | parameterization   |                    | lognormal distributions                       |
|                         | selection          +--------------------+-----------------------------------------------+
|                         |                    | `option_2`__       | Specify means and error factors for the       |
|                         |                    |                    | lognormal distributions                       |
|                         |                    +--------------------+-----------------------------------------------+
|                         |                    | `option_3`__       | Specify lambdas and zetas for the lognormal   |
|                         |                    |                    | distributions                                 |
+-------------------------+--------------------+--------------------+-----------------------------------------------+

.. __: variables-lognormal_uncertain-parameters-option_1.html
__ variables-lognormal_uncertain-parameters-option_2.html
__ variables-lognormal_uncertain-parameters-option_3.html



**Description**



Lognormal variables must be parameterized in one of three ways:

- `option_1`: mean and standard deviation
- `option_2`: mean and error factor
- `option_3`: lambda and zeta

This keyword anchors that selection.