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Table 4 The formulae for the computation of each cell in a 2×2 contingency table

From: iADRs: towards online adverse drug reaction analysis

Cell

The formula

a

count(p1, p2, … p n , d, s)

b

count(p1, p2, … p n , d) – a

c

count(p1, p2, … p n , s) – a

d

count(p1, p2, … p n ) – a – b – c