hoef                  package:geoR                  R Documentation

_D_a_t_a _f_o_r _s_p_a_t_i_a_l _a_n_a_l_y_s_i_s _o_f _e_x_p_e_r_i_m_e_n_t_s

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

     The 'hoef' data frame has 25 rows and 5 columns.
      The data consists of a uniformity trial for which _artificial_
     treatment effects were assign to the plots.

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

     data(hoef)

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

     This data frame contains the following columns:

     _x_1 x-coordinate of the plot.

     _x_2 y-coordinate of the plot.

     _d_a_t the _artificial_ data.

     _t_r_a_t the treatment number.

     _u_t the data from the uniformity trial, without the treatment
          effect.

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

     The treatment effects assign to the plots are:

        *  Treatment 1: tau1 = 0

        *  Treatment 2: tau2 = -3

        *  Treatment 3: tau3 = -5

        *  Treatment 4: tau4 = 6

        *  Treatment 5: tau5 = 6

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

     Ver Hoef, J.M. & Cressie, N. (1993) Spatial statistics: analysis
     of field experiments. In Scheiner S.M. and Gurevitch, J. (Eds)
     _Design and Analysis of Ecological Experiments_. Chapman and Hall.

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

     hoef.geo <- as.geodata(hoef, covar.col=4)
     summary(hoef)
     summary(hoef.geo)
     points(hoef.geo, cex.min=2, cex.max=2, pt.div="quintiles")

