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Table 1 Exponential, Weibull and log-logistic distributions

From: Estimating time-to-onset of adverse drug reactions from spontaneous reporting databases

Distribution Exponential Weibull Log-logistic
Density f (x) = λ e -λx (x)=λβ ( λ x ) β - 1 e ( - ( λ x ) β ) f(x)= λ β ( λ x ) β - 1 ( 1 + ( λ x ) β ) 2
Support x > 0 x > 0 x > 0
Parameter(s) λ > 0 λ > 0 λ > 0
   β > 0 β > 0
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BMC Medical Research Methodology

ISSN: 1471-2288

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