bramblecanes            package:spatstat            R Documentation

_H_u_t_c_h_i_n_g_s' _B_r_a_m_b_l_e _C_a_n_e_s _d_a_t_a

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

     Data giving the locations and ages of bramble canes in a field. A
     marked point pattern.

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

     data(bramblecanes)

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

     An object of class `"ppp"'  representing the point pattern of
     plant locations. Entries include

       `x'      Cartesian x-coordinate of plant
       `y'      Cartesian y-coordinate of plant
       `marks'  factor with levels 0,1, 2 indicating age

     See `ppp.object' for details of the format.

_N_o_t_e_s:

     These data record the (x,y) locations and ages of bramble canes in
     a  field 9 metres square, rescaled to the unit square.  The canes
     were classified according to age as either newly emergent,  one or
     two years old. These are encoded as marks 0, 1 and 2 respectively
     in the dataset.

     The data were recorded and analysed by Hutchings (1979) and
     further analysed by Diggle (1981a, 1981b, 1983), Diggle and Milne
     (1983), and Van Lieshout and Baddeley (1999). All analyses found
     that the pattern of newly emergent canes exhibits clustering,
     which Hutchings attributes to ``vigorous vegetative
     reproduction''.

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

     Hutchings (1979), data published in Diggle (1983)

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

     Diggle, P. J. (1981a) Some graphical methods in the analysis of
     spatial point patterns. In Interpreting multivariate data, V.
     Barnett (Ed.) John Wiley and Sons. 

     Diggle, P. J. (1981b). Statistical analysis of spatial point
     patterns. N.Z. Statist. 16, 22-41.

     Diggle, P.J. (1983) Statistical analysis of spatial point
     patterns. Academic Press.

     Diggle, P. J. and Milne, R. K. (1983) Bivariate Cox processes:
     some models for bivariate spatial point patterns. Journal of the
     Royal Statistical Soc. Series B  45, 11-21.

     Hutchings, M. J. (1979) Standing crop and pattern in pure stands
     of Mercurialis perennis and Rubus fruticosus in mixed deciduous
     woodland. Oikos 31, 351-357.

     Van Lieshout, M.N.M. and Baddeley, A.J. (1999) Indices of
     dependence between types in multivariate point patterns.
     Scandinavian Journal of Statistics 26, 511-532.

