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Correctly handle variances and correlations in powder workflow #171

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nvaytet opened this issue Apr 17, 2023 · 1 comment
Open

Correctly handle variances and correlations in powder workflow #171

nvaytet opened this issue Apr 17, 2023 · 1 comment

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@nvaytet
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nvaytet commented Apr 17, 2023

Variances were dropped in the powder (POWGEN) workflow in #170 because broacast operations with variances are now forbidden in Scipp.
We need to implement an alternative way of keeping track of the variances (and correlations) in the workflow.
Should probably be based on an analytical computation of the correlations, as done in Heybrock et al. (2023) (Journal of Neutron Research).
@SimonHeybrock
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Should try the "upper bound" approach.

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@SimonHeybrock @nvaytet