

lagplot {sgeostat}                           R Documentation

_L_a_g _S_c_a_t_t_e_r _P_l_o_t

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

     Create a spatially lagged scatter plot, e.g. plot z(s)
     versus z(s+h), where h is a lag in a pair object.

_U_s_a_g_e_:

     lagplot(point.obj, pair.obj, v1, v2=v1, lag=1, std=F, query.a, xlim, ylim)

_A_r_g_u_m_e_n_t_s_:

point.obj: a point object generated by `point()'

pair.obj: a pair object generated by `pair()'

      v1: a variable to plot

      v2: an optional variable name, if entered the plot
          will be created between `v1' and `v2'

     lag: the lag to plot

     std: a logical variable indicating whether the data
          should be standardized to their means and standard
          deviations before plotting

 query.a: an optional variable name, if entered, the value
          of the variable will be displayed on the graphics
          device for points identified by the user.

    xlim: a vector of length 2 indicating the x limits of
          the graphics page

    ylim: a vector of length 2 indicating the y limits of
          the graphics page

_V_a_l_u_e_:

     NULL

_N_o_t_e_:

     When `query.a' is entered, the user will be prompted to
     identify points on the display device. Because each
     point in the plot represents a pair of locations, the
     user must identify each point twice, once for the
     "from" point and once for the "to" point. Querying is
     ended by pressing the middle mouse button on the mouse
     while the cursor is in the display window.

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

     http://www.gis.iastate.edu/SGeoStat/homepage.html

_S_e_e _A_l_s_o_:

     `point', `pair'

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

     opar <- par(ask = interactive() && .Device == "X11")
     lagplot(maas.point,maas.pair,'zinc')
     # with identifying pairs:
     lagplot(maas.point,maas.pair,'zinc',lag=2,query.a='zinc')
     par(opar)

