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.

_R_e_f_e_r_e_n_c_e_s:

     Venables, W. N. and Ripley, B. D. (2002) _Modern Applied
     Statistics with S._ Fourth edition.  Springer.

_S_e_e _A_l_s_o:

     'chem', 'abbey'.

