coop                  package:MASS                  R Documentation

_C_o-_o_p_e_r_a_t_i_v_e _T_r_i_a_l _i_n _A_n_a_l_y_t_i_c_a_l _C_h_e_m_i_s_t_r_y

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

     Seven specimens were sent to 6 laboratories in 3 separate batches
     and each analysed for Analyte.  Each analysis was duplicated.

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

     data(coop)

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

     This data frame contains the following columns:

     `_L_a_b' Laboratory, `L1', `L2', ..., `L6'.

     `_S_p_c' Specimen, `S1', `S2', ..., `S6'.

     `_B_a_t' Batch, `B1', `B2', `B3' (nested within `Spc/Lab'),

     `_C_o_n_c' Concentration of Analyte in g/kg.

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

     Analytical Methods Committee (1987)   Recommendations for the
     conduct and interpretation of co-operative trials,  The Analyst
     112, 679-686.

_S_e_e _A_l_s_o:

     `chem', `abbey'.

