.. _method-multifidelity_sampling-numerical_solve-solver_metric-norm_estimator_variance-norm_order:

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norm_order
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Utilize the response covariance metric for guiding adaptive refinement during UQ.



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**Specification**

- *Alias:* None

- *Arguments:* REAL

- *Default:* 2


**Description**


The covariance option allows the user to override the default refinement
control, in particular activating the L2 norm of the change in response
covariance option despite the presence of any level mappings.



