Likelihood Ratio Formula

Equation for calculate likelihood ratio is,

LR⁺ = (a/(a+c)) / (b/(b+d))
LR⁻ = (c/(a+c)) / (d/(b+d))

where,
T⁺ = result of the test is positive,
T⁻ = result of the test is negative,
D⁺ = present disease,
D⁻ = absent present,
LR⁺ = Positive likelihood ratio,
LR⁻ = Negative likelihood ratio