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SPC (Statistical Process Control) - I have data, now what?

S

Shawn97701 - 2009

#1
The company that I work for deals with electrical data. They now want to use SPC. I know some of the basics (bell curves, X/Y chart), but what do I do with the data? (new to this part of Quality)
 
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Bev D

Heretical Statistician
Staff member
Super Moderator
#2
Re: SPC- I have data, now what?

The short answer is to get a good book on SPC (Grant & Leavenworth or Steve Wise or Montgomery). Alternately you can do a web search to start your learning process.

You should know what SPC is before you collect data by the way. Knowing what you will analyzing and how will tell you waht data to collect. Collecting the data first will lead you to trying to make the data fit the tool...

In the meantime start by plotting the data in time series and look at it. What does it tell you?
 

BradM

Staff member
Admin
#3
Re: SPC- I have data, now what?

You know what? I appreciate people asking such questions:yes:. It's better than going off sticking data in some program, getting these nice, fancy charts, and not having a clue what they mean.

First, you really need to develop a strategy; a plan of what you want to do. What do you want to measure? What are you looking for? What will matter? Of course, when in doubt, measure it. Excel has a lot of columns:D

Next, you will want to figure out what tool/method you (and your management) can understand and gives you useful information.

I would suggest pulling up threads here on Control charts. That will be a really good start. Steve Prevette and others have written some valuable threads on how to apply, when to use, etc.

Like Bev suggested, a good book is a start. Also, check your local community college and see about a course offered in it. Too, check with your local ASQ section. They may have some people willing to help you (for little or nothing).

If you would like, you can give some more details on your process, # of variables, etc. and generate some more discussion.
 
D

David DeLong

#5
Re: SPC- I have data, now what?

The short answer is to get a good book on SPC (Grant & Leavenworth or Steve Wise or Montgomery).
I agree that one should either take a good SPC seminar or at least the Statistica Quality Control by Grant & Levenworth. I was given this book in 1982 when I took the 5 day SPC seminar sponsored at that time by Ford.
 

Caster

An Early Cover
Trusted Information Resource
#9
Shawn is coming to the course.
Shawn - you are in good hands, Steve is the man.

For those who can't get training, I second the mention of books by Wheeler. I bought most of them on my own coin. They were worth every penny of my hard earned money.

Caster
 
C

CliffK

#10
Understanding must come before data. Without understanding, you do not have data. You have a collection of numbers.

Contrary to advice already given, don't even play around with run charts until you've had some training or done some reading.

Better yet, invest in a mentor. Get somebody from your local tech school to review your first efforts, after training.

Misinformation is worse than ignorance.
 
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