R/z_conf.R

In npm27/domo:

#' 95 percent confidence interval for z distribution
#' 
#' This function computes a 95 percent confidence interval for means based off the z-distribution
#' @keywords confidence_interval
#' @param x a list object
#' @export
#' @examples
#' conf.z()

conf.z = function(x){
  
  n = length(x)
  m = mean(x)
  s = sd(x)
  
  z.error = qnorm(0.975) * s / sqrt(n)
  
  left = m - z.error
  right = m + z.error
  
  variable = c("left", "mean", "right")
  value = c(left, m, right)
  data.frame(variable, value)
  
}

#document()