sunspot                 package:boot                 R Documentation

_A_n_n_u_a_l _M_e_a_n _S_u_n_s_p_o_t _N_u_m_b_e_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     'sunspot' is a time series of class '"rts"' 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.

_N_o_t_e:

     These data are not related to dataset of the same name in the
     'trellis'  library.  They are, however, similar to the 'S-Plus'
     dataset 'sunspots' except that this set contains annual averages
     instead of monthly averages and it is for a longer period of time.

_S_o_u_r_c_e:

     The data were obtained from

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

_R_e_f_e_r_e_n_c_e_s:

     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.

