llikPois {rxode2}

log-likelihood for the Poisson distribution

Description

log-likelihood for the Poisson distribution

Usage

llikPois(x, lambda, full = FALSE)

Arguments

x

non negative integers

lambda

non-negative means

full

Add the data frame showing x, mean, sd as well as the fx and derivatives

Details

In an rxode2() model, you can use llikPois() but you have to use all arguments. You can also get the derivatives with llikPoisDlambda()

Value

data frame with fx for the pdf value of with dLambda that has the derivatives with respect to the parameters at the observation time-point

Author(s)

Matthew L. Fidler

Examples

llikPois(0:7, lambda = 1)

llikPois(0:7, lambda = 4, full=TRUE)

# In rxode2 you can use:

et <- et(0:10)
et$lambda <- 0.5

model <- function() {
  model({
    fx <- llikPois(time, lambda)
    dLambda <- llikPoisDlambda(time, lambda)
  })
}

rxSolve(model, et)