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Frequently Asked Questions
==========================


Q. How do I wrap my model?
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See this guide on :doc:`wrapping models </user_guide/wrappers>`.


Q. Which technique can I use for pre-existing results?
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DMIM, RBD-FAST, PAWN and HDMR methods are "given-data" approaches and can be independently applied.


Q. How do I get the sensitivity results?
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Call the :code:`.to_df()` method if you would like Pandas DataFrames.

If using the SALib Interface, see :doc:`SALib Interface Basics </user_guide/basics_with_interface>`.


Q. How can I plot my results?
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SALib provides some basic plotting functionality. See the subsection "Basic Plotting" in :doc:`SALib Interface Basics </user_guide/basics_with_interface>`

See also, `these examples <https://github.com/SALib/SALib/tree/main/examples/plotting>`_.


Q. Why does the Sobol' method implemented in SALib normalize outputs?
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Estimates of Sobol' indices can be biased in cases where model outputs are non-centered.
We have opted to normalize outputs with the standard deviation.

See the discussion `here <https://github.com/SALib/SALib/issues/109#issuecomment-268499001>`_.

In practice, non-normalized model outputs are still usable but requires larger sample sizes for
the indices to converge.