Help With GR&R (Gage R&R) on JMP ***JMP people please help***

Hi All,
I am new to JMP and well I am having a little trouble with it. I am running a GR&R for a film thickness tool (non-destructive.) I have had 49 sites on 3 wafers measured by 3 operators. I know the site count is high, but I wanted to make sure the recipe and sites were what we were actually measuring.

I entered the data in JMP as follows:

Column 1: Site #
Column 2: X position
Column 3: Y position
Column 4: Operator
Column 5: Trial #
Column 6: Thickness measured

From there I select Graph>Variability/Gauge Chart then I use Thickness as the y,response and Site, Operator for the X, grouping.

I then select Gauge Studies>Gauge RR. Then I get this error
"Grouping columns cannot be Continuous."

I think it is telling me to adjust/sort/calculate my columns differently, but I can't figure out exactly what it wants....

JMP experts out there please help this lost soul.

Change the column attributes to discrete variables. The problem is the software thinks site number is a number that can be divided, multiplied added and subtracted!

Best Wishes,

Tom

Tom,
You are AWESOME! Thank you so much for the quick response. I feel lame for not figuring it out, but glad you knew what was up immediately.
Thanks,
Thomas