

_T_h_e _I_n_t_e_r_q_u_a_r_t_i_l_e _R_a_n_g_e

     IQR(x, na.rm = FALSE)

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

     This function computes interquartile range of the `x'
     values.  Note that this function computes the quartiles
     using the `quantile' function rather than following
     Tukey's recommendations.

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

     Tukey, J. W. (1977).  Exploratory Data Analysis.  Read-
     ing: Addison-Wesley.

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

     `fivenum', `range', `quantile'.

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

     data(rivers)
     IQR(rivers)

