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After you have formed a selection, it can be reduced by specifying a
further query condition. In the previous chapter, we selected all parcels
that could be affected by leakage from the underground gasoline storage
tank at the gas station shown below. We also computed the total and
average values of these properties but found that some of them have no
assessment value. In this example, we will remove from the previous
selection those properties without assessment values to obtain more
meaningful statistics.
(288706, 740328), 1:500
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Form a selection of parcels.
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