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The SIM2D Procedure

Syntax: SIM2D Procedure

The following statements are available in PROC SIM2D:

PROC SIM2D options ;
BY variables ;
COORDINATES coordinate-variables ;
GRID grid-options ;
ID variable ;
RESTORE store-options ;
SIMULATE simulate-options ;
MEAN mean-options ;

The SIMULATE and MEAN statements are hierarchical; you can specify any number of SIMULATE statements, but you must specify at least one. If you specify a MEAN statement, it refers to the preceding SIMULATE statement. If you omit the MEAN statement, a zero-mean model is simulated.

You must specify a single COORDINATES statement to identify the and coordinate variables in the input data set when you perform a conditional simulation. You must also specify a single GRID statement to specify the grid information.

Table 80.1 outlines the options available in PROC SIM2D classified by function.

Table 80.1 Options Available in the SIM2D Procedure

Task

Statement

Option

Data Set Options

   

Specify an input data set

PROC SIM2D

DATA=

Specify a grid data set

GRID

GDATA=

Specify labels for individual grid points or in 1-D

GRID

LABEL

Specify correlation model and parameters

SIMULATE

MDATA=

Write simulated values

PROC SIM2D

OUTSIM=

Specify plot display and options

PROC SIM2D

PLOTS

Specify a quadratic form data set

MEAN

QDATA=

Specify plot display and options

PROC SIM2D

PLOTS

Declaring the Role of Variables

   

Specify variables to define analysis subgroups

BY

 

Specify a variable with observation labels

ID

 

Specify the conditioning variable

SIMULATE

VAR=

Specify the and coordinate variables in the DATA= data set

COORDINATES

XC= YC=

Specify the and coordinate variables in the GDATA= data set

GRID

XC= YC=

Specify the constant coefficient variable in the QDATA= data set

MEAN

CONST=

Specify the linear coefficient variable in the QDATA= data set

MEAN

CX=

Specify the linear coefficient variable in the QDATA= data set

MEAN

CY=

Specify the quadratic coefficient variable in the QDATA= data set

MEAN

CXX=

Specify the quadratic coefficient variable in the QDATA= data set

MEAN

CYY=

Specify the quadratic coefficient variable in the QDATA= data set

MEAN

CXY=

Controlling the Simulation

   

Specify the number of grid points in one-dimensional cases

GRID

NPTS=

Specify the number of realizations

SIMULATE

NUMREAL=

Specify the seed value for the random generator

SIMULATE

SEED=

Controlling the Mean Quadratic Surface

   

Specify the CONST term

MEAN

CONST=

Specify the linear term

MEAN

CX=

Specify the linear term

MEAN

CY=

Specify the quadratic term

MEAN

CXX=

Specify the quadratic term

MEAN

CYY=

Specify the quadratic cross term

MEAN

CXY=

Controlling the Semivariogram Model

   

Specify an angle for an anisotropic model

SIMULATE

ANGLE=

Specify nested angles

SIMULATE

ANGLE=()

Specify a functional form

SIMULATE

FORM=

Specify nested functional forms

SIMULATE

FORM=()

Specify a nugget effect

SIMULATE

NUGGET=

Specify a range parameter

SIMULATE

RANGE=

Specify nested range parameters

SIMULATE

RANGE=()

Specify a minor-major axis ratio for an anisotropic model

SIMULATE

RATIO=

Specify nested minor-major axis ratios

SIMULATE

RATIO=()

Specify a scale parameter

SIMULATE

SCALE=

Specify nested scale parameters

SIMULATE

SCALE=()

Specify item store with correlation information

RESTORE

IN=

Specify model and parameters from an item store

SIMULATE

STORESELECT

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