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train_gam <- function(X,y,pars = list(numBasisFcts = 10))
{
if(!("numBasisFcts" %in% names(pars) ))
{
pars$numBasisFcts = 10
}
p <- dim(as.matrix(X))
if(p[1]/p[2] < 3*pars$numBasisFcts)
{
pars$numBasisFcts <- ceiling(p[1]/(3*p[2]))
cat("changed number of basis functions to ", pars$numBasisFcts, "
in order to have enough samples per basis function\n")
}
dat <- data.frame(as.matrix(y),as.matrix(X))
coln <- rep("null",p[2]+1)
for(i in 1:(p[2]+1))
{
coln[i] <- paste("var",i,sep="")
}
colnames(dat) <- coln
labs<-"var1 ~ "
if(p[2] > 1)
{
for(i in 2:p[2])
{
labs<-paste(labs,"s(var",i,",k = ",pars$numBasisFcts,") + ",sep="")
# labs<-paste(labs,"s(var",i,") + ",sep="")
# labs<-paste(labs,"lo(var",i,") + ",sep="")
}
}
labs<-paste(labs,"s(var",p[2]+1,",k = ",pars$numBasisFcts,")",sep="")
# labs<-paste(labs,"s(var",p[2]+1,", bs = "cc")",sep="") #factor 2 faster
# labs<-paste(labs,"s(var",p[2]+1,", bs = "cr")",sep="") # factor 2 + eps faster
# labs<-paste(labs,"lo(var",p[2]+1,")",sep="")
mod_gam <- FALSE
try(mod_gam <- mgcv::gam(formula=formula(labs), data=dat),silent = TRUE)
if(typeof(mod_gam) == "logical")
{
cat("There was some error with gam. The smoothing parameter is set to zero.\n")
labs<-"var1 ~ "
if(p[2] > 1)
{
for(i in 2:p[2])
{
labs<-paste(labs,"s(var",i,",k = ",pars$numBasisFcts,",sp=0) + ",sep="")
}
}
labs<-paste(labs,"s(var",p[2]+1,",k = ",pars$numBasisFcts,",sp=0)",sep="")
mod_gam <- mgcv::gam(formula=formula(labs), data=dat)
}
result <- list()
result$Yfit <- as.matrix(mod_gam$fitted.values)
result$residuals <- as.matrix(mod_gam$residuals)
result$model <- mod_gam
result$df <- mod_gam$df.residual
result$edf <- mod_gam$edf
result$edf1 <- mod_gam$edf1
# for degree of freedom see mod_gam$df.residual
# for aic see mod_gam$aic
return(result)
}
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