kendall                 package:irr                 R Documentation

_K_e_n_d_a_l_l'_s _c_o_e_f_f_i_c_i_e_n_t _o_f _c_o_n_c_o_r_d_a_n_c_e _W

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

     Computes Kendall's coefficient of concordance as an index of
     interrater reliability of ordinal data. The coefficient could be
     corrected for ties within raters.

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

     kendall(ratings, correct = FALSE)

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

 ratings: n*m matrix or dataframe, n subjects m raters.

 correct: a logical indicating whether the coefficient should be
          corrected for ties within raters.

_D_e_t_a_i_l_s:

     Missing data are omitted in a listwise way. 
     Kendall's W should be corrected for ties if raters did not use a
     true ranking order for the subjects. 
     A test for the significance of Kendall's W is only valid for large
     samples.

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

     A list with class '"irrlist"' containing the following components: 

 $method: a character string describing the method applied for the
          computation of interrater reliability.

$subjects: the number of subjects examined.

 $raters: the number of raters.

$irr.name: a character string specifying the name of the coefficient.

  $value: coefficient of interrater reliability.

$stat.name: a character string specifying the name and the df of the
          corresponding chi-squared test.

$statistic: the value of the test statistic.

$p.value: the p-value for the test.

  $error: the character string of a warning message if ties were found
          within raters.

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

     Matthias Gamer

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

     Kendall, M.G. (1948). Rank correlation methods. London: Griffin.

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

     'cor' 'meanrho'

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

     data(anxiety)
     kendall(anxiety, TRUE)

