

_A_r_i_t_h_m_e_t_i_c _M_e_a_n

     mean(x, trim=0, na.rm=FALSE)

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

       x: a numeric vector containing the values whose mean
          is to be computed.

    trim: the fraction (0 to 0.5) of observations to be
          trimmed from each end of `x' before the mean is
          computed.

   na.rm: a logical value indicating whether `NA' values
          should be stripped before the computation
          proceeds.

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

     Generic function for the (trimmed) arithmetic mean.  If
     `trim' is zero (the default), the arithmetic mean of
     the values in `x' is computed.  If `trim' is non-zero,
     a symmetrically trimmed mean is computed with a frac-
     tion of `trim' observations deleted from each end
     before the mean is computed.

     Missing values are ignored.

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

     `weighted.mean'

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

     x <- c(0:10, 50)
     xm <- mean(x)
     c(xm, mean(x, trim = .10))

