#' @export
#'
VarExpl.hlme <- function(x,values)
{
if(missing(x)) stop("The model should be specified")
if (!inherits(x, "hlme")) stop("use only with \"hlme\" objects")
if(missing(values)) values <- data.frame("intercept"=1)
if (!inherits(values, "data.frame")) stop("values should be a data.frame object")
if(any(is.na(values))) stop("values should not contain any missing values")
if(x$conv==1 | x$conv==2)
{
res <- matrix(0,nrow=1,ncol=x$ng)
names.random <- NULL
name.cor <- NULL
if(x$N[3]>0) names.random <- x$Xnames[which(x$idea0==1)]
if(length(x$N)>4 & x$N[5]>0) name.cor <- x$Xnames[which(x$idcor0==1)]
if(!is.null(names.random) | !is.null(name.cor))
{
names.values <- unique(c(names.random,name.cor)) #contient I(T^2))
vars <- unique(c(all.vars(x$call$random),all.vars(x$call$cor)))
if(!all(vars %in% colnames(values))) stop(paste(c("values should give a value for each of the following covariates: ","\n",vars),collapse=" "))
### pour les facteurs
for(v in colnames(values))
{
if(v %in% names(x$levels$levelsdata))
{
if(!is.null(x$levels$levelsdata[[v]]))
{
values[,v] <- factor(values[,v], levels=x$levels$levelsdata[[v]])
}
}
if(v %in% names(x$levels$levelsrandom))
{
if(!is.null(x$levels$levelsrandom[[v]]))
{
values[,v] <- factor(values[,v], levels=x$levels$levelsrandom[[v]])
if(any(is.na(values[,v]))) stop(paste("Wrong factor level in variable",v))
}
}
}
call_random <- x$call$random[2]
call_random <- gsub("factor","",call_random)
if(nrow(values)>1) warning("only the first line of values is used")
values1 <- values[1,,drop=FALSE]
var.random <- model.matrix(formula(paste("~",call_random,sep="")),data=values1)
var.cor <- values1[,name.cor]
if(!is.null(name.cor)) var.cor <- model.matrix(formula(paste("~-1+",name.cor,sep="")),data=values1)
nea <- sum(x$idea0==1)
VarU <- matrix(0,nea,nea)
if(nea==x$N[3])
{
diag(VarU) <- x$best[x$N[1]+x$N[2]+1:x$N[3]]
}
else
{
VarU[lower.tri(VarU,diag=TRUE)] <- x$best[x$N[1]+x$N[2]+1:x$N[3]]
VarU <- t(VarU)
VarU[lower.tri(VarU,diag=TRUE)] <- x$best[x$N[1]+x$N[2]+1:x$N[3]]
}
numer <- var.random %*% VarU %*% t(var.random)
if(x$ng>1)
{
nw <- rep(1,x$ng)
if(x$N[4]>0) nw <- c((x$best[x$N[1]+x$N[2]+x$N[3]+1:x$N[4]])^2,1)
numer <- rep(numer,x$ng) * nw
}
Corr <- 0
if(length(x$N)>4 & x$N[5]>0)
{
if(x$N[5]==1)
{
Corr <- (x$best[x$N[1]+x$N[2]+x$N[3]+x$N[4]+x$N[5]+1])^2 * var.cor
}
if(x$N[5]==2)
{
Corr <- (x$best[x$N[1]+x$N[2]+x$N[3]+x$N[4]+x$N[5]+2])^2
}
}
denom <- numer + Corr + (x$best[length(x$best)])^2
res[1,] <- as.numeric(numer/denom *100)
}
rownames(res) <- "%Var"
colnames(res) <- paste("class",1:x$ng,sep="")
}
else
{
cat("Output can not be produced since the program stopped abnormally. \n")
res <- NA
}
return(res)
}
#' Percentage of variance explained by the (latent class) linear mixed model
#' regression
#'
#' The function provides the percentage of variance explained by the (latent
#' class) linear mixed regression in a model estimated with \code{hlme},
#' \code{lcmm}, \code{multlcmm} or \code{Jointlcmm}.
#'
#'
#' @aliases VarExpl VarExpl.hlme VarExpl.lcmm VarExpl.Jointlcmm
#' VarExpl.multlcmm
#' @param x an object of class \code{hlme}, \code{lcmm}, \code{multlcmm} or
#' \code{Jointlcmm}
#' @param values a data frame with a unique row that contains the values of the
#' variables in random and the time variable in the correlation process from
#' which the percentage of variance should be calculated.
#' @return For \code{hlme}, \code{lcmm}, and \code{Jointlcmm} objects, the
#' function returns a matrix with 1 row and ng (ie the number of latent
#' classes) columns containing (the class specific) percentages of variance
#' explained by the linear mixed regression.
#'
#' For \code{multlcmm} objects, the function returns a matrix containing (the
#' class specific) percentages of variance explained by the linear mixed
#' regression for each outcome. The resulting matrix is composed of as many
#' rows as outcomes and as many columns as latent classes.
#' @author Cecile Proust-Lima, Viviane Philipps
#' @seealso \code{\link{hlme}}, \code{\link{lcmm}}, \code{\link{multlcmm}},
#' \code{\link{Jointlcmm}}
#' @examples
#'
#' \dontrun{
#' m1 <- multlcmm(Ydep1+Ydep2~1+Time*X2+contrast(X2),random=~1+Time,
#' subject="ID",randomY=TRUE,link=c("4-manual-splines","3-manual-splines"),
#' intnodes=c(8,12,25),data=data_lcmm,
#' B=c(-1.071, -0.192, 0.106, -0.005, -0.193, 1.012, 0.870, 0.881,
#' 0.000, 0.000, -7.520, 1.401, 1.607 , 1.908, 1.431, 1.082,
#' -7.528, 1.135 , 1.454 , 2.328, 1.052))
#'
#' # variation percentages explained by linear mixed regression
#' VarExpl(m1,data.frame(Time=0))
#' }
#'
#' @export
#'
VarExpl <- function(x,values) UseMethod("VarExpl")
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