The following statements are available in the SIM2D procedure:
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 x and y 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 91.1 outlines the options available in PROC SIM2D classified by function.
Table 91.1: Options Available in the SIM2D Procedure
Task |
Statement |
Option |
---|---|---|
Data Set Options |
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Specify an input data set |
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Specify a grid data set |
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Specify labels for individual grid points or in 1-D |
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Specify correlation model and parameters |
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Write simulated values |
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Specify plot display and options |
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Specify a quadratic form data set |
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Specify plot display and options |
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Declaring the Role of Variables |
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Specify variables to define analysis subgroups |
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Specify a variable with observation labels |
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Specify the conditioning variable |
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Specify the x and y coordinate variables in the DATA= data set |
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Specify the x and y coordinate variables in the GDATA= data set |
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Specify the constant coefficient variable in the QDATA= data set |
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Specify the linear x coefficient variable in the QDATA= data set |
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Specify the linear y coefficient variable in the QDATA= data set |
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Specify the quadratic x coefficient variable in the QDATA= data set |
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Specify the quadratic y coefficient variable in the QDATA= data set |
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Specify the quadratic coefficient variable in the QDATA= data set |
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Controlling the Simulation |
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Specify the number of grid points in one-dimensional cases |
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Specify the number of realizations |
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Specify the seed value for the random generator |
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Controlling the Mean Quadratic Surface |
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Specify the CONST term |
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Specify the linear x term |
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Specify the linear y term |
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Specify the quadratic x term |
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Specify the quadratic y term |
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Specify the quadratic cross term |
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Controlling the Semivariogram Model |
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Specify an angle for an anisotropic model |
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Specify nested angles |
ANGLE= () |
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Specify a functional form |
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Specify nested functional forms |
FORM= () |
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Specify a nugget effect |
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Specify a range parameter |
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Specify nested range parameters |
RANGE= () |
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Specify a minor-major axis ratio for an anisotropic model |
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Specify nested minor-major axis ratios |
RATIO= () |
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Specify a scale parameter |
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Specify nested scale parameters |
SCALE= () |
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Specify item store with correlation information |
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Specify model and parameters from an item store |