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Context-Aware Computing by De Gruyter

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Table 3.9: Probabilistic Customer and CustomerLoc relations.

(a) Probabilistic Customer relation (tuple-level uncertainty)

(b) Probabilistic CustomerLoc relation (attribute-level uncertainty), where N(μ, 𝜎2) is normal distribution with probabilistic density function f( x )= 1 2πσ e ( xμ ) 2 2 σ 2 , μ is mean and 𝜎2 is variance.

IDCNameLocation
l1LilyN(2, 1)
l2TomN(5, 1)
l3JessicaN(3, 1)

The probability of each possible world can be computed by multiplying its tuples’ probabilities.

Besides tuple-wise uncertainty, attribute-level uncertainty (e.g., Location attribute in the CustomerLoc relation in Table 3.9(b)) ...

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