Dear Ted ,

    I am interested to know more about how you apply the ANOVA in your
    daily process optimisation .Can you enlighten on this aspects .

          Thanks

    HH 290599



>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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