fossil                package:SemiPar                R Documentation

_F_o_s_s_i_l _d_a_t_a

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

     The 'fossil' data frame has 106 observations on fossil shells.

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

     data(fossil)

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

     This data frame contains the following columns:

     _a_g_e age in millions of years

     _s_t_r_o_n_t_i_u_m._r_a_t_i_o ratios of strontium isotopes

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

     Bralower, T.J., Fullagar, P.D., Paull, C.K., Dwyer, G.S. and
     Leckie, R.M. (1997). Mid-cretaceous strontium-isotope stratigraphy
     of deep-sea sections. _Geological Society of America Bulletin_,
     *109*, 1421-1442.

_R_e_f_e_r_e_n_c_e_s:

     Ruppert, D., Wand, M.P. and Carroll, R.J. (2003)
      _Semiparametric Regression_ Cambridge University Press.
      <URL: http://stat.tamu.edu/~carroll/semiregbook/>

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

     library(SemiPar)
     data(fossil)
     attach(fossil)
     plot(age,strontium.ratio)

