Thanks for all the work. I tried to do a polynomial regression, and got a pretty good y and x relationship. The R^2 is 0.998. I would like to use powerfit, however I have no idea how good the powerfit in relating y and x.
What I want to achieve is to establish a specification for a medical device that my company is making. Given a acceptable pressure value to average patient population, I need to find out the best fit flowrate value. From the flowrate, I can find out the relationship between volume and time. Thanks everyone for the inputs.
here is the detailed information of the heat sealing validation: The contents of the pouch consists of three different components, and they are relatively light. Hence, I would not consider the long term weight impact of those components on the sealed area. What I am considering is the impact of time and enviromental factors that make the sealed…[Read more]
Ron: Thanks for your prompy reply. Do you know of any goood website that I can get those information? I don’t have extensive background on reliability. Thanks!P/S: When I perform Weibull Analysis, what kind of data do I need?
I am a moron on t-test in fact. Can you please tell me in more detail what do you mean by ” If you have say 15 tubes measured before and after annealing you would take the differences between the measurements and sum them. The null hypothesis between non-annealed and annealed is that the signs on the differences are equally…[Read more]
Jim: how many subgroup of data that I need so that I can use the UCL/LCL on the charts? The reason I ask because I need to establish UCL/LCL for a process on the production floor for in-process inspection. I want to be able to justify using UCL/LCL on the charts. Do I need to use different set-up at the machine, then collect more data, and create…[Read more]
Erik, Thank you for your prompt and detail reply. I appreciate that. Actually my question is more complicated than that. Can I have your e-mail so that I can send an e-mail to you describe more detail, and hope you can help me. Thanks!
seem like you always respond to my posting real quick. thanks!
well, back to your response to my posting, if the $$$ is the best way of measuring, then how do you trace cost accurately? Use activity based costing? woey
Is anyone knows a statistically significant sample size for First Article Inspection? Why some people calculate Ppk (instead of Cpk) when they analyze measurement for First Article Inspection? Let me know, and I appreciate your kind help.