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prithahait2
USA
2 Posts |
 Posted - 03/15/2016 : 6:33:34 PM
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Origin Ver. and Service Release (Select Help-->About Origin): 2016
Operating System:Windows 7
Hi,
The Xbar plot requires a minimum of 2 data points in a subgroup to provide a LCL and UCL. Is there an automatic way to plot individual data points and get the LCL and UCL? I am trying to modify the Xbar and R plot types but am not able to.
Thanks! |
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Shirley_GZ
China
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Posted - 03/16/2016 : 03:09:45 AM
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Hi,
Yes, according to the algorithm, the QC(X bar R) chart requires at least two data points for a subgroup. Can you tell me why you want to plot individual data points and get the LCL and UCL? Because, as I understand it, if there is only one data point in a subgroup, you can’t get the mean and SD of the subgroups.Then how can you get the LCL and UCL?
Thanks,
Shirley
Originlab Technical Service Team |
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prithahait2
USA
2 Posts |
Posted - 03/16/2016 : 12:16:37 PM
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Hi Shirley,
I am trying to get the LCL and UCL for the entire set: as in for all individual values in the data set.
It would be calculated as LCL= Xmean - 3*SD, UCL= Xmean +3*SD where Xmean and SD would be for the entire data set.
Bottomline, I want to figure out a way to automatically calculate Xmean, SD, UCL and LCL for all data not just within a sub-group.
Is this something that can be generated using Origin?
Or is there a help line I can call? |
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Shirley_GZ
China
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Xbar SPC
