llikF function

log likelihood and derivatives for F distribution

llikF(x, df1, df2, full = FALSE)

Arguments

• x: variable that is distributed by f distribution
• df1, df2: degrees of freedom. Inf is allowed.
• full: Add the data frame showing x, mean, sd as well as the fx and derivatives

Returns

data frame with fx for the log pdf value of with dDf1 and dDf2

that has the derivatives with respect to the df1/df2 parameters at the observation time-point

Details

In an rxode2() model, you can use llikF() but you have to use the x and rate arguments. You can also get the derivative of df1 and df2 with llikFDdf1() and llikFDdf2().

Examples

x <- seq(0.001, 5, length.out = 100)

llikF(x^2, 1, 5)

model <- function(){
  model({
    fx <- llikF(time, df1, df2)
    dMean <- llikFDdf1(time, df1, df2)
    dSd <- llikFDdf2(time, df1, df2)
  })
}

et <- et(x)
et$df1 <- 1
et$df2 <- 5

rxSolve(model, et)

Author(s)

Matthew L. Fidler