R/pops.R

In mice: Multivariate Imputation by Chained Equations

#' Project on preterm and small for gestational age infants (POPS)
#'
#' Subset of data from the POPS study, a national, prospective study on preterm
#' children, including all liveborn infants <32 weeks gestational age and/or <1500
#' g from 1983 (n = 1338).
#'
#' The data set concerns of subset of 959 children that survived up to the age
#' of 19 years.
#'
#' Hille et al (2005) divided the 959 survivors into three groups: Full
#' responders (examined at an outpatient clinic and completed the
#' questionnaires, n = 596), postal responders (only completed the mailed
#' questionnaires, n = 109), non-responders (did not respond to any of the
#' mailed requests or telephone calls, or could not be traced, n = 254).
#'
#' Compared to the postal and non-responders, the full response group consists
#' of more girls, contains more Dutch children, has higher educational and
#' social economic levels and has fewer handicaps. The responders form a highly
#' selective subgroup in the total cohort.
#'
#' Multiple imputation of this data set has been described in Hille et al (2007)
#' and Van Buuren (2012), chapter 8.
#' @note This dataset is not part of \code{mice}.
#' @name pops
#' @aliases pops pops.pred
#' @docType data
#' @format \code{pops} is a data frame with 959 rows and 86 columns.
#' \code{pops.pred} is the 86 by 86 binary predictor matrix used for specifying
#' the multiple imputation model.
#' @source
#' Hille, E. T. M., Elbertse, L., Bennebroek Gravenhorst, J., Brand, R.,
#' Verloove-Vanhorick, S. P. (2005).  Nonresponse bias in a follow-up study of
#' 19-year-old adolescents born as preterm infants. Pediatrics, 116(5):662666.
#'
#' Hille, E. T. M., Weisglas-Kuperus, N., Van Goudoever, J. B., Jacobusse, G.
#' W., Ens-Dokkum, M. H., De Groot, L., Wit, J. M., Geven, W. B., Kok, J. H., De
#' Kleine, M. J. K., Kollee, L. A. A., Mulder, A. L. M., Van Straaten, H. L. M.,
#' De Vries, L. S., Van Weissenbruch, M. M., Verloove-Vanhorick, S. P. (2007).
#' Functional outcomes and participation in young adulthood for very preterm and
#' very low birth weight infants: The Dutch project on preterm and small for
#' gestational age infants at 19 years of age. Pediatrics, 120(3):587595.
#'
#' Van Buuren, S. (2018).
#' \href{https://stefvanbuuren.name/fimd/sec-selective.html#pops-study-19-years-follow-up}{\emph{Flexible Imputation of Missing Data. Second Edition.}}
#' Chapman & Hall/CRC. Boca Raton, FL.
#' @keywords datasets
#' @examples
#' pops <- data(pops)
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