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CR: Largest Subgroup Size Supported by CHARTrunner

Revision Date: 2005-09-19

Problem:

What is the largest subgroup size supported by CHARTrunner?

Solution:

When you define an X-bar chart, on the data definition tab, you may map up to 40 measurement columns. This will result in a chart where each data point is the average of 40 columns of data. So the general answer is that 40 is the largest subgroup size supported.

However, there is an exception; when you use advanced row selection and you use the option to form subgroups whenever a column changes (we call this grouping) you cannot predict ahead of time how many rows might fall into each group. In this case the first 30 rows might form the first subgroup (imagine this is January) the second 27 rows might form the next subgroup (imagine this is February) - then imagine that March contained 80 rows. In this case the subgroup size is variable. The first point on the chart is the average of 30 rows - the second point on the chart is the average of 27 rows - the third point on the chart is the average of 80 rows. In this case the subgroup size of 80 will work. When you do advanced row selection/grouping - the largest subgroup size we support is 100. If any grouping results in more than 100 rows – an error message will be generated.

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