Meng-Ying Assuming that you generated your line with a Spherical model, range 3, 27 samples making 9 ranges the variance within that line will (theoretically) be 0.9191 of the semi-variogram sill.
Of course this theory depends on you have every possible sample in that length, not just 27 of them. Isobel http://uk.geocities.com/drisobelclark/practica.htm
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