R/data.R

In emilygoren/MixtClust: Robust Clustering for Complete and Incomplete Data

#' 
#' Gamma ray burst (GRB) data
#'
#' Data on gamma ray bursts from the 
#' Burst and Transient Source Experiment (BATSE) 4Br catalogue. 
#' There are nine features 
#' (T50, T90, F1, F2, F3, F4, P64, P256, P1024) on 1,973 GRBs,
#' where the features are defined as:
#' \itemize{
#'   \item{T50, T90:}{The time by which 50 and 90 percent of the flux arrive, respectively.}
#'   \item{F1, F2, F3, F4:}{The time-integrated fluences in spectral channels 20–50, 50–100, 100–300 and >300 keV, respectively.}
#'   \item{P64, P256, P1024:}{The peak fluxes as measured within bins of 64, 256 and 1024 ms, respectively.}
#' }
#' 
#' Missing values are represented with NA and non-missing values 
#' have been log10 transformed.
#'
#' @name grb
#'
#' @usage data(grb)
#'
#' @docType data
#'
#' @format An object of class \code{"matrix"} with 
#' 1973 rows (records/observations) and 9 columns (features).
#' 
#' @references Souradeep Chattopadhyay & Ranjan Maitra, 2017.
#' "Gaussian-mixture-model-based cluster analysis finds five kinds 
#' of gamma-ray bursts in the BATSE catalogue," Monthly Notices 
#' of the Royal Astronomical Society, 
#' 469(3): 3374-3389. 
#' https://doi.org/10.1093/mnras/stx1024
#' 
#' Souradeep Chattopadhyay & Ranjan Maitra, 2018.
#' "Multivariate t-mixture-model-based cluster analysis of BATSE 
#' catalogue establishes importance of all observed parameters,
#' confirms five distinct ellipsoidal sub-populations of gamma-ray
#' bursts," Monthly Notices of the Royal Astronomical Society,
#' 481(3): 3196-3209.
#' https://doi.org/10.1093/mnras/sty1940
#' 
#' Emily Goren & Ranjan Maitra, 2021.
#' "Model-based clustering of partial records," arXiv:2103.16336.
#' https://arxiv.org/abs/2103.16336
#' 
#' 
#' @examples
#' data(grb)
#' 
"grb"