Dear Meng-Ying,
If you imagine the 1 million samples (total dataset and area) overlying a pattern of 1000 low and high grade regions, your 1000 sample set
you would only want one sample from each low grade and each high grade region, if you had two samples in one low grade region, this
region would be overweighted (introduction of bias to your estimate),
so you would want to remove the extra sample, the two samples being
in the same low grade patch will be within range of each other.
Digby
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