Time
9 hours 3 minutes
Difficulty
Beginner
CEU/CPE
9

Video Transcription

00:00
Hi, guys. Welcome to getting started six Sigma conversion tables. I'm Catherine MacGyver, and today we're gonna understand how to use a sigma table.
00:11
So what is a Sigma conversion table? It is primarily used in six Sigma, and we use it to convert DPM Oh, or yield rate to Sigma level. As you advance in your training specifically to black belt,
00:27
you will learn the calculation for converting DP Moro yield rate to Sigma level.
00:34
However, the tables are standard available and there is minimal variation. My advice to you is when you get ready to calculate your sigma levels are taking your DPM Oh, which we learned how to calculate in the previous module
00:52
and converting it to a sigma level for your executive report.
00:57
Um,
00:58
I google it or use whatever search engine is your preference. And the reason why is while there are standard tables available, many of those tables go to different different levels of significant figures. So if it is a 6.25 as compared to a 6.2,
01:18
there is more specificity in it. So you confined tables that like I'm going to show you in the next side,
01:23
that are zero significant figures, just that first number with no decimal points behind it, and you confined tables that go out to foreign five that give you additional specificity. There is going to be some variation when you look at the tables in the calculations, and it has to do with who created those tables.
01:44
The reason why is because when we start talking about significant figures and rounding,
01:49
if I calculate out to three significant figures and my peer calculates out to five, there may be a slight difference depending on how the numbers round up or down to get to that signal level. So when you're looking at the tables, there is a slight difference.
02:07
It is okay. It has to do with the specificity.
02:09
The larger the more decimal points behind the first signal level, the more variation you'll see between different tables
02:20
so really, really quickly. What a Sigma table looks like is you're going to have a column for your signal level. That's going to be the number that you're looking for. You'll have a column for your DPM. Oh,
02:32
and you'll have a column for your yield rate. Ah, couple of other tables will also show you defects per unit.
02:39
There may be another column that is related to the inverse of yield rates. So your defect rate, which is different than your d p m O.
02:53
But what you're going to look for is, let's say,
02:55
let's let's use our previous example where the DPM Oh, that we calculated was about 266,000. So looking at our Sigma table, we know that our Sigma is somewhere between two and three.
03:13
More than likely, it's going to be closer to two because of the exponential factor.
03:17
But we have word. That particular process in our previous module is operating between a two and a three signal level. So our area for improvement is to move between a three and a four or a foreign a five. But that's how you do a very quick conversion from your DPM. Oh,
03:37
to your signal level for reporting.
03:39
Um, it is a very easy tool. It is a very standard tool. This is certainly nothing to be ashamed of. If you don't necessarily know how to calculate your signal level. It is what all practitioners use. It is also very easily available. So,
03:55
um any lean six Sigma book. If you opt to get a book, will have it. If not, you can get PdF copies
04:02
publicly available. It is it is specific to the Six Sigma discipline, so you're not necessarily going to see a signal conversion table in a statistics course or in a statistics book because
04:17
Six Sigma or that reporting signal levels related to operational or organizational accuracy
04:25
is an exclusively six Sigma practice.

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