Incorporating measurement error into Dunnetts analysisI want to start incorporating my measurement error into my dunnetts analysis. I have attached a file below which has two variables which I am trying to determine if they are different. Both variables were tested 3 times and each test was measured 3 times. Since I am trying to determine if the variables are different in the past I've always just averaged all 3 measurements and used as the value for each test in my dunnetts analysis. However I was interested in finding out if there was a way to incorporate the error in my measurements into my analysis. Also, I was hoping for instructions on how to do this for myself since I will be doing this kind of analysis frequently in the future. Thank you.
AnalyticsScriptingRe: Incorporating measurement error into Dunnetts analysisNot sure whether I understand you right,
but if you take the raw data for your analysis, you will see the error right in the result of the analysis. So I would take the raw data.
The analysis tells you, if the error is large in comparison to the difference between variables you want to detect.
But of course you need to care about the measurement, it needs to be precise enough to detect the difference you need to detect.
That's the reason, why you might need to do a MSA before starting real measurements.
Re: Incorporating measurement error into Dunnetts analysisHi Georg,
Sorry for the delayed reply. You mentioned doing an MSA. What is that? I haven't heard that term before.
What you have suggested is one of the ways I've tried to do this analysis. But the issue I have is that it gives my experiment more power than it actually has. My experiment is looking at whether or not the variables are different. To do determine if this is true I have done 3 tests. So my n=3 for each variable. But if I take all of the measurement values JMP is analyzing the data like my n=9 which it does not. I unfortunately cannot fix the inherent error in my measurements. Looking at it from this perspective is it possible to use all of my measurement points and then manually change the n variable?
