S.Y.Exponential: Marginal survival function for exponential random variable Y,...
In mbannick/survDeconvolution: Survival Deconvolution

If !correlated: Y ~ Exponential(λ) If correlated: Y ~ Exponential(λ \cdot k) \quad K ~ Gamma(a, b)

1	S.Y.Exponential(t, a, b, parameters, correlated)

`t`	A number or vector, the survival times
`a`	A number, the shape parameter of Gamma frailty distribution
`b`	A number, the rate parameter of Gamma frailty distribution
`parameters`	A list, with an element named lambda, the rate parameter of the exponential distribution
`correlated`	If TRUE, random variable is conditionally exponential on the frailty parameter, that has `Gamma(shape=a, rate=b)` distribution.