Nothing

```
##########################################################################
# These functions are
# Copyright (C) 2014-2020 V. Miranda & T. Yee
# Auckland University of Technology & University of Auckland
# All rights reserved.
dinvgamma <- function (x,
scale = 1/rate,
shape,
rate = 1,
log = FALSE) {
if (!is.logical(log.arg <- log) || length(log) != 1)
stop("Bad input for argument 'log'")
rm(log)
i <- which(x < .Machine$double.eps)
if (log.arg) {
data <- dgamma(x = 1/x, shape = shape, scale = 1/scale,
log = log.arg) - 2*log(ifelse(x > 0, x, Inf))
} else {
data <- dgamma(x = 1/x, shape = shape, scale = 1/scale,
log = log.arg)/(x^2)
}
if(length(i))
data[i] <- dgamma(x = 1/x, shape = ifelse(shape == 1, 2*shape, shape),
scale = 1/scale, log = log.arg)[i]
data
}
pinvgamma <- function (q,
scale = 1/rate,
shape,
rate = 1,
lower.tail = TRUE,
log.p = FALSE) {
i <- which(q < 0)
data <- pgamma(1/q, shape = shape, scale = 1/scale,
lower.tail = !lower.tail, log.p = log.p)
if(length(i))
data[i] <- pgamma(1/q, shape = shape, scale = 1/scale,
lower.tail = lower.tail, log.p = log.p)[i]
return(data)
}
qinvgamma <- function (p,
scale = 1/rate,
shape,
rate = 1,
lower.tail = TRUE,
log.p = FALSE)
1/qgamma(p = p, shape = shape, scale = 1/scale,
lower.tail = !lower.tail, log.p = log.p)
rinvgamma <- function (n,
scale = 1/rate,
shape,
rate = 1)
1/rgamma(n = n, shape = shape, scale = 1/scale)
```

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