aosat                 package:UsingR                 R Documentation

_A_r_t_i_c _O_s_c_i_l_l_a_t_i_o_n _d_a_t_a _b_a_s_e_d _o_n _S_A_T _d_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     A time series of January, February, and March measurements of the
     annular modes from January 1851 to March 1997.

_U_s_a_g_e:

     data(aosat)

_F_o_r_m_a_t:

     The format is: first column is date in years with fraction to
     indicate month. The second column is the measurement.

_D_e_t_a_i_l_s:

     See <URL: http://jisao.washington.edu/ao/> for more details on the
     importance of this time series.

_S_o_u_r_c_e:

     This data came from the file
     AO_SATindex_JFM_Jan1851March1997.ascii at <URL:
     http://www.atmos.colostate.edu/ao/Data/ao_index.html>

_E_x_a_m_p_l_e_s:

     data(aosat)
     ## Not run: 
     library(zoo)
     z = zoo(aosat[,2], order.by=aosat[,1])
     plot(z)
     ## yearly
     plot(aggregate(z, floor(index(z)), mean))
     ## decade-long means
     plot(aggregate(z, 10*floor(index(z)/10), mean))
     ## End(Not run)

