| T O P I C R E V I E W |
| juilinlee |
Posted - 15 Oct 2010 : 17:51:01
Dear Quinn-Curtis support team,
I was trying to create an Mean Range Chart with very sample subgroup size which is 1, 3 and 5. Is that possible to have different sample subgroup size in the same chart?
Thanks for your advice. |
| 1 L A T E S T R E P L I E S (Newest First) |
| quinncurtis |
Posted - 16 Oct 2010 : 02:46:49
The only Variable Control chart which support variable sample size is the Mean-Sigma chart - search on MEAN_SIGMA_CHART_VSS in the manual. You must use that specific chart type in the manner described in the manual. See the VariableSampleSizeControlCharts example.
Using a Mean-Sigma chart implies that you have a relatively large average sample size, i.e. > 10, compared to an mean-range chart. Under no circumstances should you use a sample size of 1, since the sigma of a sample size of one is undefined.
This is in accordance with "Introduction to Statistical Quality Control" by Douglas Montgomery, a primary reference for the software. |
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