R/Est_Corr_NHT.r

In samplingVarEst: Sampling Variance Estimation

Est.Corr.NHT <- function(VecY.s, VecX.s, VecPk.s, N)
{
  if(! is.vector(VecY.s)              ){stop("VecY.s must be a vector.")                                                                   }
  if(! is.vector(VecX.s)              ){stop("VecX.s must be a vector.")                                                                   }
  if(! is.vector(VecPk.s)             ){stop("VecPk.s must be a vector.")                                                                  }
  if(anyNA(VecPk.s)                   ){stop("There are missing values in VecPk.s.")                                                       }
  if(min(VecPk.s)<=0|max(VecPk.s)>1   ){stop("There are invalid values in VecPk.s.")                                                       }
  if(anyNA(VecY.s)                    ){stop("There are missing values in VecY.s.")                                                        }
  if(anyNA(VecX.s)                    ){stop("There are missing values in VecX.s.")                                                        }
  if(length(N) != 1                   ){stop("Value of N must be a scalar, i.e. a vector of length 1.")                                    }
  if(N%%1 != 0                        ){stop("N must be an integer or a double-precision scalar with zero-valued fractional part.")        }
  n                                    <- length(VecY.s)
  if(n != length(VecPk.s)             ){stop("The lengths of VecY.s and VecPk.s are different.")                                           }
  if(n != length(VecX.s)              ){stop("The lengths of VecY.s and VecX.s are different.")                                            }
  if(length(VecPk.s) != length(VecX.s)){stop("The lengths of VecPk.s and VecX.s are different.")                                           }
  DoubleN                              <- as.double(N)
  .C("Est_Corr_NHT",
      as.double(VecY.s), 
      as.double(VecX.s), 
      as.double(VecPk.s), 
      n,
      DoubleN,
      PointEst = double(1),
      PACKAGE = "samplingVarEst")$PointEst
}