janka                package:SemiPar                R Documentation

_J_a_n_k_a _h_a_r_d_n_e_s_s _d_a_t_a

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

     The 'janka' data frame has 36 observations on Australian timber
     samples.

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

     data(janka)

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

     This data frame contains the following columns:

     _d_e_n_s a measure of density of the timber.

     _h_a_r_d_n_e_s_s the Janka hardness (structural property) of the timber.

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

     Williams, E.J. (1959) _Regression Analysis_, New York: John Wiley
     & Sons.

_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(janka)
     attach(janka)
     plot(dens,hardness)

