.. _variables-lognormal_uncertain-means:

"""""
means
"""""


First parameter of the lognormal distribution (options 1 & 2)



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

   variables-lognormal_uncertain-means-std_deviations
   variables-lognormal_uncertain-means-error_factors


**Specification**

- *Alias:* lnuv_means 

- *Arguments:* REALLIST


**Child Keywords:**

+-------------------------+--------------------+--------------------+-----------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword     | Dakota Keyword Description                    |
|                         | Group              |                    |                                               |
+=========================+====================+====================+===============================================+
| Required (Choose One)   | Spread             | `std_deviations`__ | Second parameter of the lognormal             |
|                         |                    |                    | distribution (option 1)                       |
|                         |                    +--------------------+-----------------------------------------------+
|                         |                    | `error_factors`__  | Second parameter of the lognormal             |
|                         |                    |                    | distribution (option 2)                       |
+-------------------------+--------------------+--------------------+-----------------------------------------------+

.. __: variables-lognormal_uncertain-means-std_deviations.html
__ variables-lognormal_uncertain-means-error_factors.html



**Description**


For the lognormal variables, one may specify either the mean :math:`\mu`  and standard deviation :math:`\sigma`  of the actual lognormal distribution, the mean :math:`\mu` and error factor :math:`\epsilon`  of the actual lognormal distribution.

This corresponds to the mean of the lognormal random variable



