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#' Probit link with guessing and lapsing rates
#'
#' Creates a complementary log-log link function; the guessing rate and lapsing rate are fixed, hence link is
#' a function of only one variable.
#
# OPTIONAL INPUT
#
#' @param guessing (optional) guessing rate; default is 0
#' @param lapsing (optional) lapsing rate; default is 0
#
# OUTPUT
#
#' @returns link probit link for use in all GLM functions
#' @importFrom stats qnorm pnorm dnorm
probit_link <-function( guessing = 0, lapsing = 0 ) {
#
# Probit link for use with GLM functions
#
# The guessing rate and lapsing rate are fixed, hence link is
# a function of only one variable.
#
# OPTIONAL INPUT
#
# guessing - guessing rate; default is 0
# lapsing - lapsing rate; default is 0
#
# OUTPUT
#
# link - probit link for use in all GLM functions
# LINK FUNCTIONS
# PROBIT WITH LIMITS
# link
probitFL<-function( mu, g, l ) {
mu <- pmax( pmin( l - .Machine$double.eps, mu ), g
+ .Machine$double.eps );
return( qnorm( ( mu - g ) / ( l - g ) ) );
}
# derivative
probitFD<-function( eta, g, l ) {
eta <- pmax( qnorm( .Machine$double.eps / ( l - g ) ), eta );
eta <- pmin( -qnorm( .Machine$double.eps / ( l - g ) ), eta );
return( ( l - g ) * dnorm( eta ) );
}
# inverse link
probitFI<-function( eta, g, l ) {
eta <- pmax( qnorm( .Machine$double.eps / ( l - g ) ), eta );
eta <- pmin( -qnorm( .Machine$double.eps / ( l - g ) ), eta );
return( g + ( l - g ) * pnorm( eta ) );
}
# User-defined link
linkuser <- function( guessing, lapsing ) {
linkl <- "probitFL";
linkd <- "probitFD";
linki <- "probitFI";
linkfun <- function(mu) eval( call( linkl, mu, guessing, 1-lapsing ) );
linkinv <- function(eta) eval( call( linki, eta, guessing, 1-lapsing ) );
mu.eta <- function(eta) eval( call( linkd, eta, guessing, 1-lapsing ) );
link <- paste("probit( ", "c(", guessing, ", ", 1-lapsing, ")", " )",
sep = "" );
structure(list(linkfun = linkfun, linkinv = linkinv,
mu.eta = mu.eta, name = link),
class = "link-glm" );
}
# MAIN PROGRAM
# CHECK ROBUSTNESS OF INPUT PARAMETERS
checkinput( 'guessingandlapsing', c( guessing, lapsing ) );
return( linkuser( guessing, lapsing ) );
}
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