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#' Part 1 of element [1, 1] for Fisher Information matrix
#'
#' Function computing part 1 of element [1, 1] for Fisher Information matrix computation. The Fisher Information matrix is
#' splitted in the four elements ([1, 1], [1, 2], [2, 1], [2, 2]). Each element is split in part 1 and part 2
#'
#' @param nvData The vector of data.
#' @param nTheta1 The first parameter.
#' @param nTheta2 The second parameter.
#' @param lDensityExpr List of symbolic expressions of density, cumulative and derivatives.
#'
fisherEl11Part1 = function(nvData, nTheta1, nTheta2, lDensityExpr) {
# computation of the argument
nvArg11Part1 = -eval(expr = lDensityExpr$eDerivDensityFunTheta[1]) ^ 2 /
eval(expr = lDensityExpr$eDensityFun)
# substitute NA values with zero values
nvArg11Part1[is.na(nvArg11Part1)] = 0
return(nvArg11Part1)
}
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