co2                  package:stats                  R Documentation

_M_a_u_n_a _L_o_a _A_t_m_o_s_p_h_e_r_i_c _C_O_2 _C_o_n_c_e_n_t_r_a_t_i_o_n

_D_e_s_c_r_i_p_t_i_o_n:

     Atmospheric concentrations of CO2 are expressed in parts per
     million (ppm) and reported in the preliminary 1997 SIO manometric
     mole fraction scale.

_U_s_a_g_e:

     data(co2)

_F_o_r_m_a_t:

     A time series of 468 observations; monthly from 1959 to 1997.

_D_e_t_a_i_l_s:

     The values for February, March and April of 1964 were missing and
     have been obtained by interpolating linearly between the values
     for January and May of 1964.

_S_o_u_r_c_e:

     Keeling, C. D. and  Whorf, T. P., Scripps Institution of
     Oceanography (SIO), University of California, La Jolla, California
     USA 92093-0220.

     <URL: ftp://cdiac.esd.ornl.gov/pub/maunaloa-co2/maunaloa.co2>.

_R_e_f_e_r_e_n_c_e_s:

     Cleveland, W. S. (1993) _Visualizing Data_. New Jersey: Summit
     Press.

_E_x_a_m_p_l_e_s:

     data(co2)
     plot(co2, ylab = expression("Atmospheric concentration of CO"[2]),
          las = 1)
     title(main = "co2 data set")

