Can I apply First Time Yield (FTY) for several products or processes of different nature?

#1
Hello, I already know a bit about FTY RFTY FPY, but I always find that those indicators works for a single process. I want to apply it for 2 non consecutive processes of different products. As an example line 1 makes agricultural tools and lets say that it has a FPY of .95 and the line 2 produces automotive parts with a fpy of .98. How can use FTY as a unique number for that company with 2 lines of production?.
 
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Bev D

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#2
Mathematically you can but why would you want to? What do you think will accomplish? What different actions would be taken?
 
#3
Mathematically you can but why would you want to? What do you think will accomplish? What different actions would be taken?
Our CEO wants to consolidate a report for the company and ask me to do it. I started to searching the fundamentals of the concept in order to do it properly.

such a number doesn't say anything to me. That's why I'm looking for help. maybe there is a right way to do it, merging the numbers I already have or construct a new FPY making a sum of the products.
thank you for your help (in advance)
 

Miner

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#6
Our CEO wants to consolidate a report for the company and ask me to do it. I started to searching the fundamentals of the concept in order to do it properly.

such a number doesn't say anything to me. That's why I'm looking for help. maybe there is a right way to do it, merging the numbers I already have or construct a new FPY making a sum of the products.
thank you for your help (in advance)
The probable reason that Bev is asking is that the more you aggregate numbers like this the more information is lost. The variation in the aggregate value is dampened to the point that it stops signaling a problem. On the rare occasion that it might signal a problem, you have no insight into the reason.
 
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