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This thread is carried over and continued in the Current Elsmar Cove Forums 
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This thread is carried over and continued in the Current Elsmar Cove Forums
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The New Elsmar Cove Forums
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 The New Elsmar Cove Forums
 Statistical Techniques and 6 Sigma
 MTTR
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| Author | Topic: MTTR |
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Michael Busha unregistered |
posted 12 April 2001 09:48 AM
 
Does anyone know a quick and dirty way to calculate MTTR? We have two kinds of solenoid valves, one is ISO rated, the other is not. I want to prove that the MTTR of the ISO rated valve is not significantly different from that of the non ISO rated valve. We have the capability of actually disassembling and reassembling both valves to get an accurate measure. Is there a formula I can plug the values into? Thanks for any help. The results of this analysis could save my company $40,000. IP: Logged |
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Marc Smith Cheech Wizard Posts: 4119 |
posted 15 April 2001 02:02 AM
 
I would relate it to MTBF and do an accellerated life test. I don't know how to do MTTRepair. Can you state the difference between MTBF and MTTR? IP: Logged |
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Al Dyer Forum Wizard Posts: 622 |
posted 15 April 2001 03:46 PM
Would the data involved be attribute or variable data? Would also like to know if what you are looking for is Mean Time Between Failure? We do alot of tool life studies (drills, insers etc...) which is basically MTFB. It's a good tool and can have a quick payback on investment time (cost). ASD... IP: Logged |
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Abe unregistered |
posted 16 April 2001 03:28 AM
[QUOTE]Originally posted by Michael Busha: [B]Does anyone know a quick and dirty way to calculate MTTR? Yes, a.Take 5 of the ISO valves and 5 of the other type Make this test twice with one tecnician repairing ISO velve and one the other one than switch tecnicians and repate Good luck IP: Logged |
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Abe unregistered |
posted 16 April 2001 03:37 AM
quote: IP: Logged |
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Michael Busha unregistered |
posted 16 April 2001 07:20 AM
Thanks Abe. The procedure looks great but, I'm embarrassed to say I cannot find "T-test" in any of my references. Could you elaborate? IP: Logged |
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Abe unregistered |
posted 16 April 2001 09:48 AM
quote: Hi Michael, T-test is a statistical test of hypothesis that compare two samles and make a statement with some confidence whether the two samples came from one (No MTTR difference)or two populations (significant MTTR difference). You may find infronation on this subject in any statistical textbook If you need more information or help you may email me at [email protected] Avi IP: Logged |
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Roger Eastin Forum Wizard Posts: 345 |
posted 17 April 2001 08:25 AM
Just a thought: Some MTTR data are not normally distributed, so be careful when applying your t-test. Check your data first to determine whether it is normally distributed or not. If it is not,do a transformation (for instance, take the square root of the data) on the data to approximate normality and then do your t-test. This is a typical technique used in designed experiments and it works well. IP: Logged |
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Abe unregistered |
posted 23 April 2001 01:29 AM
Michael, Please resend me your mail. The one i have came out wrong so you did not get my answere. Abe IP: Logged |
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