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revweibull_link_private <-function( K, guessing, lapsing ) {
#
# THIS IS AN INTERNAL FUNCTION: USE REVWEIBULL_LINK INSTEAD
#
# Reverse Weibull link for use with GLM functions
#
# The guessing rate and lapsing rate are fixed, and power parameter
# is set to be equal K, hence link is a function of only one variable.
#
# INPUT
#
# K - power parameter for reverse Weibull link function
# guessing - guessing rate
# lapsing - lapsing rate
#
# OUTPUT
#
# link - reverse Weibull link for use in all GLM functions
# link
revweibullFL<-function( mu, g, l, k ) {
mu <- pmax( pmin( l - .Machine$double.eps, mu ), g
+ .Machine$double.eps );
return( -( -log( ( mu - g ) / ( l - g ) ) )^( 1 / k ) );
}
# derivative
revweibullFD<-function( eta, g, l, k ) {
eta <- pmax( -( -log( .Machine$double.eps / ( l - g ) ) )^( 1 / k ),
eta );
eta <- pmin( -( -log( 1 - .Machine$double.eps / ( l - g ) ) )^( 1 / k ),
eta );
return( - ( ( -eta )^k * k * exp( -( -eta )^k ) * ( l - g ) ) / eta );
}
# inverse link
revweibullFI<-function( eta, g, l, k ) {
eta <- pmax( -( -log( .Machine$double.eps / ( l - g ) ) )^( 1 / k ),
eta );
eta <- pmin( -( -log( 1 - .Machine$double.eps / ( l - g ) ) )^( 1 / k ),
eta );
return( g + ( l - g ) * exp( -( -eta )^k ) );
}
# User-defined link
linkuser <- function( K, guessing, lapsing ) {
linkl <- "revweibullFL";
linkd <- "revweibullFD";
linki <- "revweibullFI";
linkfun <- function(mu) eval( call( linkl, mu, guessing, 1-lapsing, K ) );
linkinv <- function(eta) eval( call( linki, eta, guessing, 1-lapsing, K ) );
mu.eta <- function(eta) eval( call( linkd, eta, guessing, 1-lapsing, K ) );
link <- paste("revweibull_link( ", K, ", ", "c(", guessing, ", ",
1-lapsing, ")", " )", sep = "" );
structure(list(linkfun = linkfun, linkinv = linkinv,
mu.eta = mu.eta, name = link),
class = "link-glm" );
}
# MAIN PROGRAM
return( linkuser( K, guessing, lapsing) );
}
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