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Line 9: ==Example of nested data== Consider a batch process that uses 7 monitor [[wafer\|wafers]] in each run. The plan further calls for measuring a [[response variable]] on each wafer at each of 9 sites. The organization of the [[sampling plan]] has a hierarchical or nested structure: the batch run is the topmost level, the second level is an individual wafer, and the third level is the site on the wafer. The total amount of data generated per batch run will be 7 · 9 = 63 observations. One approach to analyzing these data would be to compute the [[mean]] of all these points as well as their [[standard deviation]] and use those results as responses for each run.

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