I HAVE USED (AND QUITE SUCCESSFULLY) ANOVA MAINLY FOR EITHER R&D
(DETERMINATION OF OPTIMAL CONDITIONS) OR TROUBLE SHOOTING PROCESSES
(ESPECIALLY WHEN THERE IS MORE THAN 1 PROCESS SUSPECT OF CAUSING A
PROBLEM).

HOWEVER I HAVE NEVER TRIED TO USE IT AS A SOLE MEANS TO DETERMINE PROCESS
CAPABILITY AND REPEATABILITY.

I HAVE FOUND X BAR AND R CHARTS THE BEST TO DO THIS FUNCTION. THEY GIVE YOU
THE BEST "PICTURE" OF WHAT IS REALLY GOING ON IN YOUR PROCESS, AND IF ANY
CHANGES MADE HAVE MADE - WHETHER THERE IS AN IMPROVEMENT OR VISE VERSA.

I DO THINK THAT ANOVA CAN BE USED AS A SUPPLEMENTARY TOOL TO X BAR AND R
CHARTS. PERFORMING DESIGN OF EXPERIMENTS (DOE) AND ENTERING THE DATA INTO A
DOE  SOFTWARE CAN SHOW YOU OPTIMAL CONDITIONS; THOSE PROCESSES OR ITEMS
THAT MOST AFFECT AN OUTCOME YOU ARE EXPERIMENTING FOR; AND THE EFFECT OF
INTERACTION BETWEEN ITEMS.

THIS DATA CAN BE USED TO MAKE POSSIBLE IMPROVEMENTS, AND THE X BAR AND R
CHARTS YOUR MEASUREMENT OF THOSE IMPROVEMENTS.

IF YOU NEED FURTHER HELP PLEASE FEEL FREE TO EMAIL ME OFFLINE.

TED

----------
> From: Dean Jones <[log in to unmask]>
> To: [log in to unmask]
> Subject: [TN] Why ANOVA
> Date: Friday, May 28, 1999 10:11 AM
>
> Dear Technetts,
> One of our manufacturing plants is planning to use the ANOVA (analysis of
> variation) approach to calculate process capability and repeatability.
> I am not really familiar with this method of process monitoring. I've
read
> on the Internet, that ANOVA allows you to determine significant
differences
> between two or more means. But, I am not sure how it could be used for
high
> volume production process monitoring. Is this approach better than X bar
> and R charts and process capability histograms?
> Does somebody use ANOVA for this purpose? Please, share your experience
> with me.
> Sincerely,
> Stella Neyman
> Eaton Incorporation
>
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