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  1.     
  2.     _S_t_a_n_d_a_r_d _D_e_v_i_a_t_i_o_n
  3.     
  4.          sd(x,  na.rm=FALSE)
  5.     
  6.     _D_e_s_c_r_i_p_t_i_o_n:
  7.     
  8.          This function computes the standard deviation of the
  9.          values in x.  If na.rm is TRUE then missing values are
  10.          removed before computation proceeds.
  11.     
  12.