vvalen                 package:dprep                 R Documentation

_T_h_e _V_a_n _V_a_l_e_n _t_e_s_t _f_o_r _e_q_u_a_l _c_o_v_a_r_i_a_n_c_e _m_a_t_r_i_c_e_s

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

     The Van Valen nonparametric test for homocedasticity (equal
     covariance matrices).

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

     vvalen(data)

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

    data: The name of the dataset to be tested 

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

     Gives the p-value for a Kruskal Wallis test. A  p-value near to
     zero indicates homocedasticity.

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

     Edgar Acuna

_R_e_f_e_r_e_n_c_e_s:

     Van Valen, L. (1962). A study of fluctuating asymmetry. Evolution
     Vol. 16, pp. 125142.

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

     'mardia'

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

     #---------Testing homocedasticity-----
     data(colon)
     vvalen(colon)

