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 $\text{[math]}$ and $\text{[math]}$ 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 $\text{[math]}$ and $\text{[math]}$ coordinate variables in the DATA= data set	COORDINATES	XC= YC=
Specify the $\text{[math]}$ and $\text{[math]}$ 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 $\text{[math]}$ coefficient variable in the QDATA= data set	MEAN	CX=
Specify the linear $\text{[math]}$ coefficient variable in the QDATA= data set	MEAN	CY=
Specify the quadratic $\text{[math]}$ coefficient variable in the QDATA= data set	MEAN	CXX=
Specify the quadratic $\text{[math]}$ coefficient variable in the QDATA= data set	MEAN	CYY=
Specify the quadratic $\text{[math]}$ 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 $\text{[math]}$ term	MEAN	CX=
Specify the linear $\text{[math]}$ term	MEAN	CY=
Specify the quadratic $\text{[math]}$ term	MEAN	CXX=
Specify the quadratic $\text{[math]}$ 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=( $\text{[math]}$ )
Specify a functional form	SIMULATE	FORM=
Specify nested functional forms	SIMULATE	FORM=( $\text{[math]}$ )
Specify a nugget effect	SIMULATE	NUGGET=
Specify a range parameter	SIMULATE	RANGE=
Specify nested range parameters	SIMULATE	RANGE=( $\text{[math]}$ )
Specify a minor-major axis ratio for an anisotropic model	SIMULATE	RATIO=
Specify nested minor-major axis ratios	SIMULATE	RATIO=( $\text{[math]}$ )
Specify a scale parameter	SIMULATE	SCALE=
Specify nested scale parameters	SIMULATE	SCALE=( $\text{[math]}$ )
Specify item store with correlation information	RESTORE	IN=
Specify model and parameters from an item store	SIMULATE	STORESELECT

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