

   DDeellaayy iinn AAIIDDSS RReeppoorrttiinngg iinn EEnnggllaanndd aanndd WWaalleess

   AArrgguummeennttss::

       year: The year of the diagnosis.

    quarter: The quarter of the year in which diagnosis was
             made.

      delay: The time delay (in months) between diagnosis and
             reporting. 0 means that the case was reported
             within one month.  Longer delays are grouped in 3
             month intervals and the value of `delay' is the
             midpoint of the interval (therefore a value of `2'
             indicates that reporting was delayed for between 1
             and 3 months).

        dud: An indicator of censoring. These are categories
             for which full information is not yet available
             and the number recorded is a lower bound only.

       time: The time interval of the diagnosis. That is the
             number of quarters from July 1983 until the end of
             the quarter in which these cases were diagnosed.

          y: The number of AIDS cases reported.

   SSUUMMMMAARRYY::

        The `aids' data frame has 570 rows and 6 columns.

        Although all cases of AIDS in England and Wales must be
        reported to the Communicable Disease Surveillance Cen-
        tre, there is often a considerable delay between the
        time of diagnosis and the time that it is reported.  In
        estimating the prevalence of AIDS, account must be
        taken of the unknown number of cases which have been
        diagnosed but not reported.  The data set here records
        the reported cases of AIDS diagnosed from July 1983 and
        until the end of 1992.  The data are cross-classified
        by the date of diagnosis and the time delay in the
        reporting of the cases.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

   SSOOUURRCCEE::

        The data were obtained from

        De Angelis, D. and Gilks, W.R. (1994) Estimating
        acquired immune deficiency syndrome accounting for
        reporting delay.  Journal of the Royal Statistical
        Society, A, 157, 31-40.

   OOTTHHEERR RREEFFEERREENNCCEESS::

        Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Meth-
        ods and Their Application.  Cambridge University Press.

