farms                  package:MASS                  R Documentation

_E_c_o_l_o_g_i_c_a_l _F_a_c_t_o_r_s _i_n _F_a_r_m _M_a_n_a_g_e_m_e_n_t

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

     The `farms' data frame has 20 rows and 4 columns. The rows are
     farms on the Dutch island of Terschelling and the columns are
     factors describing the management of grassland.

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

     data(farms)

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

     This data frame contains the following columns:

     `_M_o_i_s' Five levels of soil moisture - level 3 does not occur at
          these 20 farms.

     `_M_a_n_a_g' Grassland management type (`SF' = standard, `BF' =
          biological, `HF' = hobby farming, `NM' = nature
          conservation).

     `_U_s_e' Grassland use (`U1' = hay production, `U2' = intermediate,
          `U3' = grazing)

     `_M_a_n_u_r_e' Manure usage - classes C0 to C4.

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

     J.C. Gower and D.J. Hand (1996) Biplots Chapman & Hall, Table 4.6. 

     Quoted as from: R.H.G. Jongman, C.J.F. ter Braak and O.F.R. van
     Tongeren (1987) Data Analysis in Community and Landscape Ecology.
     PUDOC, Wageningen

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

     data(farms)
     farms.mca <- mca(farms, abbrev=TRUE)  # Use levels as names
     eqscplot(farms.mca$cs, type="n")
     text(farms.mca$rs, cex=0.7)
     text(farms.mca$cs, labels=dimnames(farms.mca$cs)[[1]], cex=0.7)

