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author's profile photo Former Member
Former Member

SPC

Hi

I have an issue with Display Statistical value in SPC control chart screen (QGC2)

I have recorded 12 results but still I am getting message "'There is insufficiant data available""

Message no. QE720

Inspection plan -SPC task list characteristic selected

inspection char -- Sampling procedure and SPC selected, single result

Inspection Point - free inspecton point

Sampling procedure -

fixed sample, sample size -1

Mean value within tolerence

free inspection point,

Control chart # Shewart chart for x-bar/ sample/USA

I can able to see, generate, the control chart

When I want to check Statistical values in the chart, insufficant data

even i have tested with 20 results... not able to see Cp and Cpk

Can you pls throw some lights on this issue

what went wrong & how to see the Cp & Cpk in control chart window

thanks

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2 Answers

  • Best Answer
    author's profile photo Former Member
    Former Member
    Posted on Jul 03, 2010 at 04:27 PM

    The way system is behaving is correct The reason behind this is you are using range charts and your sample size is = 1.You can get the cp,cpk values if subgroup size is greater than 1. Change sample size in sample procedure (>1) , record the results - you will be able to see cp,cpk.

    In the industry, if the sample size =1 - std practice is using moving range charts than the range charts.

    Thanks,

    Ram

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  • author's profile photo Former Member
    Former Member
    Posted on Jul 04, 2010 at 06:18 AM

    thanks

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