grass               package:agricolae               R Documentation

_D_a_t_a _f_o_r _F_r_i_e_d_m_a_n _t_e_s_t

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

     Twelve homeowners are selected randomly to participate in an
     experiment with a plant nursery. Each homeowner is asked to select
     four fairly identical areas in his yard and to plant four
     different types of grasses, one in each area.

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

     data(grass)

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

     A data frame with 48 observations on the following 3 variables.

     '_j_u_d_g_e' a numeric vector

     '_t_r_t' a factor with levels 't1' 't2' 't3' 't4'

     '_e_v_a_l_u_a_t_i_o_n' a numeric vector

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

     Each of the 12 blocks consists of four fairly identical plots of
     land, each receiving care of approximately the same degree of
     skill because the four plots are presumably cared for by the same
     homeowern.

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

     Book: Practical Nonparametrics Statistics, pag 372.

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

     Practical Nonparametrics Statistics. W.J. Conover, 1999

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

     data(grass)
     str(grass)

