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+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/nonparam.R
+\name{etfe}
+\alias{etfe}
+\title{Estimate empirical transfer function}
+\usage{
+etfe(data, n = 128)
+}
+\arguments{
+\item{data}{an object of class \code{idframe}}
+
+\item{n}{frequency spacing (Default: \code{128})}
+}
+\value{
+an \code{idfrd} object containing the estimated frequency response
+}
+\description{
+Estimates the emperical transfer function from the data by taking the 
+ratio of the fourier transforms of the output and the input variables
+}
+\examples{
+data(arxsim)
+frf <- etfe(arxsim)
+
+}
+\references{
+Arun K. Tangirala (2015), \emph{Principles of System Identification: 
+Theory and Practice}, CRC Press, Boca Raton. Sections 5.3 and 20.4.2
+}
+\seealso{
+\code{\link[stats]{fft}}
+}
+