Milk                  package:nlme                  R Documentation

_P_r_o_t_e_i_n _c_o_n_t_e_n_t _o_f _c_o_w_s' _m_i_l_k

_D_e_s_c_r_i_p_t_i_o_n:

     The 'Milk' data frame has 1337 rows and 4 columns.

_F_o_r_m_a_t:

     This data frame contains the following columns:

     _p_r_o_t_e_i_n a numeric vector giving the protein content of the milk.

     _T_i_m_e a numeric vector giving the time since calving (weeks).

     _C_o_w an ordered factor giving a unique identifier for each cow.

     _D_i_e_t a factor with levels 'barley',  'barley+lupins', and 
          'lupins' identifying the diet for each cow.


_D_e_t_a_i_l_s:

     Diggle, Liang, and Zeger (1994) describe data on the protein
     content of cows' milk in the weeks following calving.  The cattle
     are grouped according to whether they are fed a diet with barley
     alone, with barley and lupins, or with lupins alone.

_S_o_u_r_c_e:

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