#' @name velo
#' @title Rotational Velocity of Stars
#' @description  A sample of rotational velocities of stars from Hoffleit and 
#' Warren (1991) similar to that previosly considered by Pal, Woodroofe and Meyer (2007)
#' and used by Koenker and Mizera (2010).  The \code{demo(velo)} illustrates fitted
#' densities for three relatively weak concavity constraints corresponding to
#' \eqn{-1/sqrt(f)}, \eqn{-1/f} and \eqn{-1/f^2} constrained to be concave.
#' Note that last of these pushes the optimization methods about as far as they can do.
#' @usage velo
#' @format  A numeric vector with 3933 observations on one variable.
#' \itemize{
#'     \item{\code{velo}}{a numeric vector with rotational velocities.}
#' }
#' @source  Hoffleit, D. and Warren, W. H. (1991). The Bright Star Catalog (5th ed.). 
#' Yale University Observatory, New Haven.
#' @references Pal, J. K., Woodroofe, M. and Meyer, M. (2007). Estimating a Polya frequency 
#' function. In Complex Datasets and Inverse Problems: Tomography, Networks and 
#' Beyond, (R. Liu, W. Strawderman, and C.-H. Zhang, eds.). IMS Lecture Notes-Monograph 
#' Series 54 239-249. Institute of Mathematical Statistics.
#' Koenker, R. and Mizera, I. (2010) Quasi-Concave Density Estimation, 
#' Annals of Statistics, 38, 2998-3027.
#' @keywords datasets

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