Spruce                 package:nlme                 R Documentation

_G_r_o_w_t_h _o_f _S_p_r_u_c_e _T_r_e_e_s

_D_e_s_c_r_i_p_t_i_o_n:

     The 'Spruce' data frame has 1027 rows and 4 columns.

_F_o_r_m_a_t:

     This data frame contains the following columns:

     _T_r_e_e a factor giving a unique identifier for each tree.

     _d_a_y_s a numeric vector giving the number of days since the
          beginning of the experiment.

     _l_o_g_S_i_z_e a numeric vector giving the logarithm of an estimate of
          the volume of the tree trunk.

     _p_l_o_t a factor identifying the plot in which the tree was grown.

_D_e_t_a_i_l_s:

     Diggle, Liang, and Zeger (1994, Example 1.3, page 5) describe data
     on the growth of spruce trees that have been exposed to an
     ozone-rich atmosphere or to a normal atmosphere.

_S_o_u_r_c_e:

     Pinheiro, J. C. and Bates, D. M. (2000), _Mixed-Effects Models in
     S and S-PLUS_, Springer, New York.  (Appendix A.28)

     Diggle, Peter J., Liang, Kung-Yee and Zeger, Scott L. (1994),
     _Analysis of longitudinal data_, Oxford University Press, Oxford.

_E_x_a_m_p_l_e_s:

     data(Spruce)

