Control Chart from SQL query results
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Hello, I ran a query to get a column of durations from a MS SQL database, and am trying to construct a control chart. What is the best way to do this? I tried to follow the example given, but there seems to be a problem because I only have one column.
Thank you
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Tom Lane
2011-10-10
If the column is a series of measurements taken over time, with no particular grouping to them, then there are charts like the "I" (individuals) chart that may be appropriate:
load spectra
controlchart(octane,'charttype','i')
Otherwise, if there are groups, you could specify a second argument that represents the grouping. For example, if each set of five consecutive measurements is taken on the same day and you want to look for day-to-day differences, then set up a vector "day" that is 1 for the first five measurements, 2 for the next five, and so on.
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