Correlation of 2 Test Devices - 2 samples (13 parameters)

O

oen28

#1
Hello all,

I'm Test Engineer in Thailand. I've got to setup the tester for electrical characteristics dc test for optoelectronic device.

I got 2 samples from customer to try whether my tester can test those samples to get the same result as their tester did. Is there anyone out there can suggest how to do correlation with only 2 samples ( 13 parameters) ?

Thanks and regards,
Chawalit
 
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Bev D

Heretical Statistician
Staff member
Super Moderator
#2
the best you can do right now is plot your results vs their results on a scatter diagram with a 45 degree line. This is called a Youden plot (some call it an isoplot. one plot for each characteristic - don't combine them. then post your results here and we can look at them. I do recommend that you measure each unit twice on your tester to ensure that your tester is repeatable. did they measure the parts more than once?

the other advice I'd give you is that if it is important that this tester corelate to the other one get more samples. You can read up on Miner's blogs...

In the future it is always good to develop your study design before collecting units and data. While I understand that you were probably just a victim in all this it's a good point to drive home with others.
 

Miner

Forum Moderator
Staff member
Admin
#3
the best you can do right now is plot your results vs their results on a scatter diagram with a 45 degree line. This is called a Youden plot (some call it an isoplot. one plot for each characteristic - don't combine them. then post your results here and we can look at them. I do recommend that you measure each unit twice on your tester to ensure that your tester is repeatable. did they measure the parts more than once?

the other advice I'd give you is that if it is important that this tester corelate to the other one get more samples. You can read up on Miner's blogs...
Bev D is referring to this blog entry: Comparison of two gauges.
 
D

Darius

#4
I'm not sure, I understand the question:confused:, but with some basic math.

being

Y1 = DEVICE1 MEASUREMENT1
Y2 = DEVICE1 MEASUREMENT2
X1 = DEVICE2 MEASUREMENT1
X2 = DEVICE2 MEASUREMENT2

NOTE: MEASUREMENT IS ONE CHARACTERISTIC
---------------------------------
Y1 = SLOPE * X1 + INTERCEPT
Y2 = SLOPE * X2 + INTERCEPT

Y1-Y2 = SLOPE (X1-X2)

SLOPE = (Y1-Y2)/(X1-X2)

INTERCEPT = Y1 - SLOPE * X1

DEVICE1 = SLOPE * DEVICE2 + INTERCEPT

To do it work more perfect, you will need, the expected minimum and maximum value, too close to a point in a line, only the blackness (the color of the point) could be seen (no trends).
 
Last edited by a moderator:

Bev D

Heretical Statistician
Staff member
Super Moderator
#5
sorry Darius, but regression is NOT appropriate for measurement systems analysis. and with only two parts even appropriate 'correlation' analysis will be highly suspect.
 
D

Darius

#6
Agree with regression not being an MSA analysis, but as you said I would suspect about any analysis done with 2 samples.

Sorry Brev, but also, IMHO, the only thing that can be done is to "traduce" the customer gauges to your own measurement, and regression is right for such task, even is a normal procedure to calibrate an instrument. But here I am to learn, and are specting to see the Youden plot in action, as I woud said "nec scire fas est omnia".
 
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