ashina                 package:ISwR                 R Documentation

_A_s_h_i_n_a'_s _c_r_o_s_s_o_v_e_r _t_r_i_a_l

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

     The 'ashina' data frame has 16 rows and 3 columns. It contains
     data from a crossover trial for the effect of an NO synthase
     inhibitor on headaches. Visual analog scale recordings of pain
     level were made at baseline and at five time points after infusion
     of the drug or placebo. A score was calculated as the sum of the
     differences from baseline. All patients received both treatment
     and placebo in randomized order.

_F_o_r_m_a_t:

     This data frame contains the following columns:

     _v_a_s._a_c_t_i_v_e a numeric vector. Summary score when given active
          substance.

     _v_a_s._p_l_a_c a numeric vector. Summary score when given placebo
          treatment.

     _g_r_p a numeric vector code. 1: placebo first, 2: active first.

_S_o_u_r_c_e:

     Original data

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

     M.Ashina et al. (1999), _Lancet_ 353, pp. 287-289

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

     data(ashina)
     plot(vas.active~vas.plac,pch=grp,data=ashina)
     abline(0,1)

