GRR a case study.

1:1 its the red rectangular right on your msa presentation?

The red square is the specification limits
The black 45 degree line is the 1:1 line (x=y)

Welshwizard said:

Hi,

Would it be possible to provide an excel file for the two studies please? I don't use Minitab so can't open the file.

Thanks in advance

Click to expand...

Yes i will attach the file on Monday

New to statistics said:

Yes i will attach the file on Monday

Click to expand...

Please find attached

I will attach the continuous data (all operators) and later for each operator as Bev D mention

To those who may be reading this thread: I have never suggested the above graphs for an MSA. First the X axis is not properly annotated so we cannot see the pairing of the repeated measurements. The run order is not obvious. The OP doesn’t provide any conclusions, leaving us to think that this is just some random graph. I only advocate for multi-vari plots or a Youden plot. Even a Xbar, R plot with the repeated measures for each point as teh subgroup would be more insightful than these plots (Western Electric SQC manual approach to MSA).

Miner said:

Added the spec limits for one set. Note that it was a unilateral spec.

View attachment 30110

Click to expand...

If we had spec on both ways then the plots would be square or it not a reason?

Miner said:

Notice the difference between Operator 1 (no repeatability) and operator 5 (decent repeatability). Also, note the poor reproducibility between them with Operator 1 having consistently higher results than Operator 5.

It's a good idea to review the data visually before diving into the statistics. In this case, you can see there is a problem that must be addressed before performing any statistical analysis.

View attachment 30103

Click to expand...

For the repeatability the values must be on one spot of the line or across the line right?

What actions should be done to address the repeatability first, training perhaps ??

If you have to make a presentation what you include (graphs, Minitab output, both) ?

New to statistics said:

If we had spec on both ways then the plots would be square or it not a reason?

Click to expand...

NO. You should add the zero for a one sided spec. This will not make the graph square. ONLY by setting the min and the max of BOTH the Y and the X axis as the same.