# Sensitivity analysis for multi outputs, if the output is calculated by simulations

**URL:** <https://uqworld.org/t/sensitivity-analysis-for-multi-outputs-if-the-output-is-calculated-by-simulations/322>\
**Category:** Community Q&A and How To\
**Created:** [December 3, 2019, 9:55pm UTC](https://uqworld.org/t/sensitivity-analysis-for-multi-outputs-if-the-output-is-calculated-by-simulations/322 "2019-12-03T21:55:31Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![damarginal](https://uqworld.org/user_avatar/uqworld.org/damarginal/32/73_2.png) [@damarginal](https://uqworld.org/u/damarginal)\
**Post date:** [December 9, 2019, 3:29pm UTC](https://uqworld.org/t/sensitivity-analysis-for-multi-outputs-if-the-output-is-calculated-by-simulations/322/8 "2019-12-09T15:29:54Z")

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Hi @Gull_Rana,

Hopefully, you can solve your problem with the answers above and the one provided by @bsudret below

> [@Computing Sobol sensitivity indices using existing input/output data](https://uqworld.org/t/computing-sobol-sensitivity-indices-using-existing-input-output-data/327/2):
>
> Dear Gullnaz You have to construct a surrogate model of your finite element model from your runs first. In order to do sensitivity analysis afterwards, a good choice is to use polynomial chaos expansions (PCE). The [Polynomial chaos expansion from existing data](https://www.uqlab.com/pce-truss-data-set) example is a good starting point. Polynomial chaos expansion Following this example, you start by defining the distribution of the input parameters of the FE model (the distributions you used to sample the inputs). If you did this step w…

If you still run into problem, be sure to post a reproducible example of your problem up to the point things don’t work. If you need to attach some data, you can also do it here given it’s not too large (\<3MB).

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