Hi All,

I have a question regarding Sobol index. I've calculated first order and total order indexes for a model. but I've got weird values for one input as the value for Sobol total order index is less than the first order one, while I expect that total order value should be at least equal (when there is no interaction) or more than the first order value.

On other other hand, I don't expect to get negative value for Sobol index which I got for this input  parameters. Whether this means that there is a negative correlation between corresponding input parameter and the model output?

I would appreciate if anybody could help me with some advice.

Thank you very much

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