sunspot                 package:boot                 R Documentation

Annual Mean Sunspot Numbers

Description:

     'sunspot' is a time series and contains 289 observations.

     The Zurich sunspot numbers have been analyzed in almost all books
     on time series analysis as well as numerous papers.  The data set,
     usually attributed to Rudolf Wolf, consists of means of daily
     relative numbers of sunspot  sightings. The relative number for a
     day is given by k(f+10g) where g is the number of sunspot groups
     observed, f is the total number of spots within the groups and k
     is a scaling factor relating the observer and telescope to a
     baseline. The relative numbers are then averaged to give an annual
     figure.    See Insenman (1983) for a discussion of the relative
     numbers. The figures are for the years 1700-1988.

Source:

     The data were obtained from

     Tong, H. (1990) _Nonlinear Time Series: A Dynamical System
     Approach_. Oxford University Press

References:

     Davison, A.C. and Hinkley, D.V. (1997)  _Bootstrap Methods and
     Their Application_. Cambridge University Press.

     Inzenman, A.J. (1983) J.R. Wolf and H.A. Wolfer: An historical
     note on the Zurich sunspot relative numbers.  _Journal of the
     Royal Statistical Society, A_, *146*, 311-318.

     Waldmeir, M. (1961) _The Sunspot Activity in the Years 1610-1960_.
     Schulthess and Co.

