DDT package:MASS R Documentation _D_D_T _i_n _K_a_l_e _D_e_s_c_r_i_p_t_i_o_n: A numeric vector of 15 measurements by different laboratories of the pesticide DDT in kale, in ppm (parts per million) using the multiple pesticide residue measurement. _U_s_a_g_e: DDT _S_o_u_r_c_e: C. E. Finsterwalder (1976) Collaborative study of an extension of the Mills _et al_ method for the determination of pesticide residues in food. _J. Off. Anal. Chem._ *59*, 169-171 R. G. Staudte and S. J. Sheather (1990) _Robust Estimation and Testing._ Wiley