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RAPLER / dst-1

Combine basic probability assignments with Dempster's rule of combination
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Empty set among the focal elements. Normalization necessary. See nzdsr function. #5

Closed garyzhubc closed 1 year ago

garyzhubc commented 1 year ago

What does this error mean?

> bel_bpa <- belplau(bpa)
Error in belplau(bpa) : 
  Invalid data: Empty set among the focal elements. Normalization necessary. See nzdsr function.
RAPLER commented 1 year ago

Hi, The error message means that some of the intersections of subsets give the empty set as a result. This is to be expected when you apply Dempster's rule of combination to a great number of distinct subsets. Inevitably, some results will be contradictory. When this is the case, we recalculate the mass values obtained by dividing the mass value of the non-empty subsets by 1 minus the mass of the empty set. This is what the function "nzdsr" do. Function "belplau" can be used on results which do not contain a non-zero mass allocated to the empty set.

Regards,

Claude

Le jeu. 29 déc. 2022 à 11:16, Peiyuan Zhu @.***> a écrit :

What does this error mean?

bel_bpa <- belplau(bpa) Error in belplau(bpa) : Invalid data: Empty set among the focal elements. Normalization necessary. See nzdsr function.

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