DIRECTIONS Statement

The VARIOGRAM Procedure

DIRECTIONS Statement

DIRECTIONS directions-list ;

The DIRECTIONS statement enables detailed control for defining the angle classes. It is a list of angles, separated by commas, with optional angle tolerances and bandwidths within parentheses following the angle. One or more angles are required. If you do not specify the optional angle tolerance, the default value of 45^o is used. If you do not specify the optional bandwidth, no bandwidth is checked.

For example, suppose you want to compute three separate semivariograms at angles $\theta_1=0^o, \theta_2=60^o$ , and $\theta_3=120^o$ , with corresponding angle tolerance $\delta \theta_1=22.5^o,\delta \theta_2=12.5^o$ ,and $\delta \theta_3=22.5^o$ , with bandwidths 50 and 40 distance units on the first two angle classes and no bandwidth check on the last angle class.

The appropriate DIRECTIONS statement is

   directions 0.0(22.5,50), 60.0(12.5,40),120,235(22.5);

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