The SPP Procedure

Output Data Sets

The SPP procedure produces output data sets that are specified in the OUT= suboption of the KERNEL option in the PROCESS statement, and in the OUTINTESITY= and OUTSIM= options in the MODEL statement. These data sets are described in the following sections.

OUT= Suboption in the KERNEL Option in the PROCESS Statement

This suboption specifies the name of an output data set to store the kernel-based nonparametric estimates. This data set contains the following variables:

KERNEL, the kernel type that is used for the corresponding intensity estimate
BANDW, the kernel bandwidth that is used for the corresponding intensity estimate
VARNAME, the label of the event variable
GXC, the x coordinate of the grid point at which the intensity estimate is made
GYC, the y coordinate of the grid point at which the intensity estimate is made
ESTIMATE, the intensity estimate

OUTSIM= Option in the PROCESS Statement

This option specifies the name of an output data set to store the simulations of distance functions that are included as options in the PROCESS statement. This data set contains the following variables:

GXC, X coordinate of current simulated event location
GYC, Y coordinate of current simulated event location
ITER, current iteration
IXY, simulated event observation number in the current iteration
MARK, label of current mark
MTYPE, categorical mark level
MVALUE, numeric mark simulated value
NITER, number of iterations in simulation
NXY, number of simulated events in current iteration
VARNAME, label of the event the results refer to

OUTINTENSITY= Option in the MODEL Statement

This option specifies the name of an output data set to store the output intensity estimate. This data set contains the following variables:

ESTIMATE, fitted intensity at current location
GXC, X coordinate of current output grid location
GYC, Y coordinate of current output grid location
STDERR, standard error for the intensity estimate
VARNAME, event label from the DATA= data sets that are associated with events and identified during the procedure call
PROB, probability of occurrence based on a logit transformation of the fitted intensity estimate at the grid. This represents the probability that the number of events at the location is not zero.

OUTSIM= Option in the MODEL Statement

This option specifies the name of an output data set to store a simulated point pattern from a fitted intensity model. This data set contains the following variables:

ESTIMATE, fitted intensity estimate at the simulated event location
GXC, X coordinate of current simulated event location
GYC, Y coordinate of current simulated event location
ITER, current simulation iteration
NITER, number of iterations in current simulation
NXY, number of simulated events in current iteration
VARNAME, event label from the DATA= data set that is associated with events and identified during the procedure call