Relaxin package:nlme R Documentation _A_s_s_a_y _f_o_r _R_e_l_a_x_i_n _D_e_s_c_r_i_p_t_i_o_n: The 'Relaxin' data frame has 198 rows and 3 columns. _F_o_r_m_a_t: This data frame contains the following columns: _R_u_n an ordered factor with levels '5' < '8' < '9' < '3' < '4' < '2' < '7' < '1' < '6' _c_o_n_c a numeric vector _c_A_M_P a numeric vector _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.