I chart or Xbar R ?

This topic has 3 replies, 4 voices, and was last updated 13 years, 6 months ago by Craig.

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August 20, 2007 at 9:01 am #47874

chhabra
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Hi. I collect 1 sample per day (variable data). Should I do an I Chart of daily data or an Xbar R chart of weekly data ? What principles drive this decision ?
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August 20, 2007 at 12:25 pm #160151

Prasoon
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You should use the Individual chart i.e I – chart because here no. of data points are less.
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August 20, 2007 at 4:44 pm #160169

Shoot me now
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wrong
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August 20, 2007 at 6:13 pm #160177

Craig
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I would also propose and IMR chart. If you used an Xbar/R chart with a subgroup size of 5, it seems as if you would be increasing the chance for within-group variation, which goes against the rational subgrouping guidelines.
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