MathAchieve package:nlme R Documentation _M_a_t_h_e_m_a_t_i_c_s _a_c_h_i_e_v_e_m_e_n_t _s_c_o_r_e_s _D_e_s_c_r_i_p_t_i_o_n: The 'MathAchieve' data frame has 7185 rows and 6 columns. _F_o_r_m_a_t: This data frame contains the following columns: _S_c_h_o_o_l an ordered factor identifying the school that the student attends _M_i_n_o_r_i_t_y a factor with levels 'No' 'Yes' indicating if the student is a member of a minority racial group. _S_e_x a factor with levels 'Male' 'Female' _S_E_S a numeric vector of socio-economic status. _M_a_t_h_A_c_h a numeric vector of mathematics achievement scores. _M_E_A_N_S_E_S a numeric vector of the mean SES for the school. _D_e_t_a_i_l_s: Each row in this data frame contains the data for one student. _E_x_a_m_p_l_e_s: summary(MathAchieve)