sd                   package:base                   R Documentation

_S_t_a_n_d_a_r_d _D_e_v_i_a_t_i_o_n

_D_e_s_c_r_i_p_t_i_o_n:

     This function computes the standard deviation of the values in
     `x'. If `na.rm' is `TRUE' then missing values are removed before
     computation proceeds. If `x' is a matrix or a dataframe, a vector
     of the standard deviation of the columns is returned.

_U_s_a_g_e:

     sd(x, na.rm = FALSE)

_S_e_e _A_l_s_o:

     `var' for its square, and `mad', the most robust alternative.

_E_x_a_m_p_l_e_s:

     sd(1:2) ^ 2

