\name{sem}
\alias{sem}
\title{sem}
\usage{
sem(x, na.rm=T)
}
\arguments{
  \item{x}{A numeric vector or an R object but not a factor coercible to numeric by as.double(x).}
  \item{na.rm}{A logical value indicating whether NA values should be stripped before the computation proceeds.}
}
\description{
This function computes the Standard Error of the Mean of the values in x. If na.rm is TRUE then missing values are removed before computation proceeds.
}
\examples{
v<-rnorm(10)
sem(v)
}