fgl                   package:MASS                   R Documentation

_M_e_a_s_u_r_e_m_e_n_t_s _o_f _F_o_r_e_n_s_i_c _G_l_a_s_s _F_r_a_g_m_e_n_t_s

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

     The `fgl' data frame has 214 rows and 10 columns. It was collected
     by B. German on fragments of glass collected in forensic work.

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

     data(fgl)

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

     This data frame contains the following columns:

     `_R_I' refractive index; more precisely the refractive index is
          1.518xxxx.

          The remaining 8 measurements are percentages by weight of
          oxides.

     `_N_a' sodium

     `_M_g' manganese

     `_A_l' aluminium

     `_S_i' silicon

     `_K' potassium

     `_C_a' calcium

     `_B_a' barium

     `_F_e' iron

     `_t_y_p_e' The fragments were originally classed into seven types, one
          of which was absent in this dataset.  The categories which
          occur are  window float glass (`WinF': 70), window non-float
          glass (`WinNF': 76), vehicle window glass (`Veh': 17), 
          containers (`Con': 13),  tableware (`Tabl': 9) and vehicle
          headlamps (`Head': 29).

