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Estimating Methods, Variability, and Sampling for Drop-Test Data
The original grid design shown in figure 2 was compared to a design with wider spacing through cross validation. Every other row was removed in the observed data set to obtain the 40- by 10-foot spacing (figure 18). This subset of 256 values was used to predict, by triangulation, values at the 288 sites that were removed.
Figure 18—The original 20-foot cup spacing was
increased to 40 feet in the north-south direction
to evaluate sampling density.
A comparison (table 6) of the predicted gpc values from the 40-foot spacings to the observed values shows a correlation of 0.78, a mean error of -0.01195 gpc and a median error of zero.
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