Stability Factor (SF) Q1/Q3
July 15, 2011 at 1:47 am #53847
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I have a question regarding Stabilty Factor as a metric in terms of Production performance.
When is this Stabilty Factor suitable to use?
What does it really provide us? Is a ration of Q1/Q3..getting to 1 means what satble
Here is my application.
Hope you guys can help me.
Currently we are collecting Cycle Time for different products
I’m talking about 50-70 different products everyday and what is interesting is that these products in not repeatable daily. We have a very high product mix 3000+++
and will run differently prodcut everyday .
These 50-70 orders per day will have different CT because of different process and parameters/raw mats.
Now if i get the daily CT of product and run descriptive stat get Q1/Q3
I will get my SF. I can get the data for for daily SF and also an over SF for a month.
Now my issue is this making sense? I was told that the main intent that we need to get the SF is to measure the stabilty of our process, we will use this as a metric.
Now I am not convince since we have a high product mix, Cycle time changes everyday. For me we can not really detect stability in this way becuase in the first place product is non -repeatable. For me that SF value will confuse me. Any improvements I made from process will not be showing stability because my CT changes due to product mix. Out of these 50-70 daily repeated products can happen only after one month. 3000+++ product mix..
Need input from you guys..Thanks
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