vif                   package:DAAG                   R Documentation

_V_a_r_i_a_n_c_e _I_n_f_l_a_t_i_o_n _F_a_c_t_o_r_s

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

     Variance inflation factors are computed for the standard errors of
     linear model coefficient estimates.

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

     vif(obj, digits=5)

_A_r_g_u_m_e_n_t_s:

     obj: A 'lm' object 

  digits: Number of digits

_V_a_l_u_e:

     A vector of variance inflation factors corresponding to  the
     coefficient estimates given in the 'lm' object.

_A_u_t_h_o_r(_s):

     J.H. Maindonald

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

     'lm'

_E_x_a_m_p_l_e_s:

     litters.lm <- lm(brainwt ~ bodywt + lsize, data = litters)
     vif(litters.lm)

     carprice1.lm <- lm(gpm100 ~ Type+Min.Price+Price+Max.Price+Range.Price,
         data=carprice)
     vif(carprice1.lm)

     carprice.lm <- lm(gpm100 ~ Type + Price, data = carprice)
     vif(carprice1.lm)

