The TREND statement enables you to define a spatial trend covariate, where name is a standard SAS variable name that names the trend and the FIELD suboption describes the field as follows:
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FIELD (X-variable, Y-variable, field-variable )
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specifies a spatial field variable as a trend by using any spatial field covariates that are available in the DATA=
data set, where X-variable specifies the X coordinate and Y-variable specifies the Y coordinate of the spatial field. The third argument is the field-variable, which is a numeric variable in the DATA=
data set.
