R/density.R

In np: Nonparametric Kernel Smoothing Methods for Mixed Data Types

npdensity <- 
    function(bws, eval, dens,
             derr = NA, ll = NA,
             ntrain, trainiseval = FALSE,
             rows.omit = NA){

        if (missing(bws) | missing(eval) | missing(dens) | missing(ntrain))
            stop("improper invocation of density constructor")

        if (length(rows.omit) == 0)
            rows.omit <- NA


        d <- list(
            bw = bws$bw,
            bws = bws,
            xnames = bws$xnames,
            nobs = nrow(eval),
            ndim = bws$ndim,
            nord = bws$nord,
            nuno = bws$nuno,
            ncon = bws$ncon,
            pscaling = bws$pscaling,
            ptype = bws$ptype,
            pckertype = bws$pckertype,
            pukertype = bws$pukertype,
            pokertype = bws$pokertype,
            eval = eval,
            dens = dens,
            derr = derr,
            log_likelihood = ll,
            ntrain = ntrain,
            trainiseval = trainiseval,
            rows.omit = rows.omit,
            nobs.omit = ifelse(identical(rows.omit,NA), 0, length(rows.omit)))


        class(d) <- "npdensity"

        return(d)
    }

print.npdensity <- function(x, digits=NULL, ...){
  cat("\nDensity Data: ", x$ntrain, " training points,",
      ifelse(x$trainiseval, "", paste(" and ", x$nobs,
                                      " evaluation points,", sep="")),
      " in ",x$ndim," variable(s)\n",sep="")

  print(matrix(x$bw,ncol=x$ndim,dimnames=list(paste(x$pscaling,":",sep=""),x$xnames)))

  cat(genDenEstStr(x))
  
  cat(genBwKerStrs(x$bws))
  
  cat("\n\n")
  if(!missing(...))
    print(...,digits=digits)
  invisible(x)
}

fitted.npdensity <- function(object, ...){
 object$dens 
}
se.npdensity <- function(x){ x$derr }
plot.npdensity <- function(x, ...) { npplot(bws = x$bws, ...) }

predict.npdensity <- function(object, se.fit = FALSE, ...) {
  tr <- eval(npudens(bws = object$bws, ...), envir = parent.frame())
  if(se.fit)
    return(list(fit = fitted(tr), se.fit = se(tr), 
                df = tr$nobs, log.likelihood = tr$ll))
  else
    return(fitted(tr))
}


summary.npdensity <- function(object, ...) {
  cat("\nDensity Data: ", object$ntrain, " training points,",
      ifelse(object$trainiseval, "", paste(" and ", object$nobs,
                                      " evaluation points,", sep="")),
      " in ",object$ndim," variable(s)\n",sep="")

  cat(genOmitStr(object))

  print(matrix(object$bw,ncol=object$ndim,dimnames=list(paste(object$pscaling,":",sep=""),object$xnames)))

  cat(genDenEstStr(object))

  cat(genBwKerStrs(object$bws))
  cat('\n\n')  

}