When to use an XmR Trend Chart

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D

Duke Okes

#2
Re: XmRTrend chart

They are generally used when n=1 and the sampling frequency is relatively low.
 
D

Darius

#3
Re: XmRTrend chart

It is recommended for continuos process, like chemical batchs.

The subgroup of 1 is used for the case when 1 is the rational subgroup of the sample (you shouldn't agrupate the data in a 5 points sample just because you want to use a subgroup of 5, the points must have a relationship which differ form the next group of data, so there is a within and between sample variation).
 
L

lifestar

#6
Re: XmR Trend chart

Use the XmR Trend chart when you believe there is a trend in the data caused by environmental factors (e.g., inflation causes rising costs).
 
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