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Statistical Comparison of Product: High Average vs. Low Range
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Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
Statistical Comparison of Product: High Average vs. Low Range
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  Post Number #1  
Old 5th February 2013, 01:34 AM
FPT2001

 
 
Total Posts: 12
Please Help! Statistical Comparison of Product: High Average vs. Low Range

I am looking for suggestions on how to statistically compare products, not processes.

We manufacture springs that are the same length but have different widths and thicknesses. We are evaluating as-is and 1, 2, 3 hour heat treat. We want to compare these products with competitor products. There is only 1 finished specification/attribute: resistance.

I am looking for help writing a protocol to compare our different product to competitors. Initial testing shows some products have larger Std. and Ranges than the others but the Mean is much higher.

How do I evaluate benefits of a higher Mean compared to other products that have a much tighter range and/or Stddev?

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  Post Number #2  
Old 5th February 2013, 10:39 AM
Bev D's Avatar
Bev D

 
 
Total Posts: 3,606
Re: Comparison of Product: High Avg vs Low Range

I think you may have the statistics cart in front of the physics horse.

A useful statistical analysis can only be determined once the real question is answered: How are your parts used and what is important to your customers?

Without physics, statistics is just gambling.
Thanks to Bev D for your informative Post and/or Attachment!
  Post Number #3  
Old 5th February 2013, 12:21 PM
Miner's Avatar
Miner

 
 
Total Posts: 4,335
Laughing Re: Comparison of Product: High Avg vs Low Range

Quote:
In Reply to Parent Post by Bev D View Post

Without physics, statistics is just gambling.
So true.
  Post Number #4  
Old 6th February 2013, 11:57 PM
FPT2001

 
 
Total Posts: 12
Re: Statistical Comparison of Product: High Average vs. Low Range

Horse and cart are just fine. We know our customers needs and wants well. You have apparently never worked with sales and marketing.

Given a customer requirement that does not identify number of cycles to failure or minimum cycles to failure... we are evaluating competitor products as well as several versions of a new product we want to introduce.

We are looking for the best statistical methods for comparing product that have a higher cycle time/high Std Dev with lower cycle time/lower std dev. Something along the lines with coefficient of variation.
  Post Number #5  
Old 7th February 2013, 12:10 AM
Miner's Avatar
Miner

 
 
Total Posts: 4,335
Question Re: Statistical Comparison of Product: High Average vs. Low Range

Bev meant no disrespect, but you have not given us much information to go on. In your first post, I thought you were talking about the spring rate. In your second post, it sounds like you are talking about the expected life, cycles to failure.

Please give us more detail, and we will try to help.
Thank You to Miner for your informative Post and/or Attachment!
  Post Number #6  
Old 7th February 2013, 02:19 PM
FPT2001

 
 
Total Posts: 12
Re: Statistical Comparison of Product: High Average vs. Low Range

Its impossible to determine tone of a text message, I didnt take it as disrespect and my reply wasnt negative. Technology still hasnt duplicated the humor/human element into a text message.

Let me just start over and simplify my question.

I have a product that does not have a Min or Max specification. The products are tested for time to failure. We want to market a new product that has a greater time to failure. When we tested our product against competitors we found we had a higher time to failure but the range and Std Dev was much higher.

We can look at the Cv for each (std dev/Mean) and make an assumption concerning the variation. However, we are looking for something to help with the marketing and sales promotion (easier to quickly understand). For instance, how can you say Product E performs better than the others even though the Std Dev and Range are higher?

Product A B C D E
Average 90 400 140 110 530
STD Dev 13 47 30 25 112
Range 38 120 100 102 385


I do appreciate your help.
  Post Number #7  
Old 7th February 2013, 02:35 PM
Jim Wynne's Avatar
Jim Wynne

 
 
Total Posts: 14,199
Re: Statistical Comparison of Product: High Average vs. Low Range

Quote:
In Reply to Parent Post by FPT2001 View Post

Its impossible to determine tone of a text message, I didnt take it as disrespect and my reply wasnt negative. Technology still hasnt duplicated the humor/human element into a text message.

Let me just start over and simplify my question.

I have a product that does not have a Min or Max specification. The products are tested for time to failure. We want to market a new product that has a greater time to failure. When we tested our product against competitors we found we had a higher time to failure but the range and Std Dev was much higher.

We can look at the Cv for each (std dev/Mean) and make an assumption concerning the variation. However, we are looking for something to help with the marketing and sales promotion (easier to quickly understand). For instance, how can you say Product E performs better than the others even though the Std Dev and Range are higher?

Product A B C D E
Average 90 400 140 110 530
STD Dev 13 47 30 25 112
Range 38 120 100 102 385


I do appreciate your help.
I'm not sure whether you're looking for a way to analyze data or a way to spin the data you already have. If I understand correctly, what you want to know is given identical load characteristics, which spring (yours or your competitor's) is most likely to fail first. Is this correct?
  Post Number #8  
Old 7th February 2013, 05:39 PM
FPT2001

 
 
Total Posts: 12
Re: Statistical Comparison of Product: High Average vs. Low Range

Yes, based on the data, which product is most likely to fail first.
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