amacrine              package:spatstat              R Documentation

_H_u_g_h_e_s' _A_m_a_c_r_i_n_e _C_e_l_l _D_a_t_a

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

     Austin Hughes' data: a point pattern  of displaced amacrine cells
     in the retina of a rabbit. A marked point pattern.

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

     data(amacrine)

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

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

       'x'      Cartesian x-coordinate of cell
       'y'      Cartesian y-coordinate of cell
       'marks'  factor with levels 'off' and 'on'
                indicating ``off'' and ``on'' cells

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

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

     Austin Hughes' data: a point pattern  of displaced amacrine cells
     in the retina of a rabbit. 152 ``on'' cells and 142 ``off'' cells
     in a rectangular sampling frame.

     The true dimensions of the rectangle are 1060 by 662 microns. The
     coordinates here are scaled to a rectangle of height 1 and width
     1060/662 = 1.601 so the unit of measurement is approximately 662
     microns.

     The data were analysed by Diggle (1986).

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

     Peter Diggle, personal communication

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

     Diggle, P. J. (1986). Displaced amacrine cells in the retina of a
     rabbit: analysis of a bivariate spatial point pattern.  _J.
     Neurosci. Meth._ *18*, 115-125.

