biexponential

bi- +‎ exponential

biexponential (not comparable)

1. (mathematics) Having two summed exponential terms.

biexponential (plural biexponentials)

1. Such a function or expression.

• A biexponential equation/function/curve/model/distribution is the sum of two exponential ones. Specifically, a biexponential model has the form ${\displaystyle y=a_{1}e^{b_{1}t}+a_{2}e^{b_{2}t}}$
• Biexponential time-series models commonly find use in pharmacokinetics.
• In statistics, the biexponential distribution ${\displaystyle Y=p\lambda _{1}e^{-\lambda _{1}{\text{ }}X}+(p-1)\lambda _{2}e^{-\lambda _{2}{\text{ }}X}}$, where ${\displaystyle 0<p<1}$, is a sum of two exponential distributions.