qq                  package:lattice                  R Documentation

_Q_u_a_n_t_i_l_e-_Q_u_a_n_t_i_l_e _P_l_o_t_s _o_f _T_w_o _S_a_m_p_l_e_s

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

     Quantile-Quantile plots for comparing two Distributions

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

     qq(formula, f.value = ppoints, ...)

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

 formula: formula of the form `y ~ x | g1 * g2 * ...', where `x' must
          be a numeric, and `y' can be a factor, shingle, character or
          numeric vector, with the restriction that there must be
          exactly two levels of `y', which divide the values of `x'
          into two groups. Quantiles for these groups will be plotted
          along the two axes. 

 f.value: function of a single integer (representing sample size),
          returning a vector of probabilities corresponding to which
          quantiles should be plotted.

     ...: Other arguments

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

     These and all other high level Trellis functions have several
     arguments in common. These are extensively documented only in the
     help page for `xyplot', which should be consulted to learn more
     detailed usage.

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

     An object of class trellis, by default plotted by `print.trellis'.

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

     Deepayan Sarkar deepayan@stat.wisc.edu

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

     `xyplot', `panel.qq', `Lattice'

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

     data(singer)
     qq(voice.part ~ height, aspect = 1, data = singer,
        subset = (voice.part == "Bass 2" | voice.part == "Tenor 1"))

