trees513              package:multcomp              R Documentation

_F_r_a_n_k_o_n_i_a_n _T_r_e_e _D_a_m_a_g_e _D_a_t_a

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

     Damages on young trees caused by deer browsing.

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

     data("trees513")

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

     A data frame with 2700 observations on the following 4 variables.

     '_d_a_m_a_g_e' a factor with levels 'yes' and 'no' indicating whether or
          not the trees has been damaged by game animals, mostly roe
          deer.

     '_s_p_e_c_i_e_s' a factor with levels 'spruce', 'fir',  'pine', 'softwood
          (other)', 'beech', 'oak', 'ash/maple/elm/lime',  and
          'hardwood (other)'.

     '_l_a_t_t_i_c_e' a factor with levels '1', ..., '53',  essentially a
          number indicating the position of the sampled area.

     '_p_l_o_t' a factor with levels 'x_1', ..., 'x_5' where 'x' is the
          lattice. 'plot' is nested within 'lattice' and is a
          replication for each lattice point.

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

     In most parts of Germany, the natural or artificial regeneration
     of forests is difficult due to a high browsing intensity. Young
     trees suffer from browsing damage, mostly by roe and red deer. In
     order to estimate the browsing intensity for serveral tree
     species, the Bavarian State Ministry of Agriculture and Foresty
     conducts a survey every three years. Based on the estimated
     percentage of damaged trees, suggestions for the implementation or
     modification of deer management plans are made. The survey takes
     place in all $756$ game management districts
     (`Hegegemeinschaften') in Bavaria. The data given here are from 
     the game management district number 513 `Unterer Aischgrund'
     (located in Frankonia between Erlangen and H\"ochstadt) in 2006.
     The data of 2700 trees include the species and a binary variable
     inicating whether or not the tree suffers from damage caused by
     deer browsing.

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

     Bayerisches Staatsministerium fuer Landwirtschaft und Forsten
     (2006), Forstliche Gutachten zur Situtation der Waldverjuengung
     2006. <URL: www.forst.bayern.de>

     Torsten Hothorn, Frank Bretz and Peter Westfall (2008),
     Simultaneous Inference in General Parametric Models.   
     _Biometrical Journal_, *50*(3) (forthcoming); See
     'vignette("generalsiminf", package = "multcomp")'.

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

       summary(trees513)

