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Topic: compare two methods for measuring concentration
Replies: 4   Last Post: Jul 17, 2012 5:05 PM

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David

Posts: 4
Registered: 6/15/12
compare two methods for measuring concentration
Posted: Jul 16, 2012 10:10 AM
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Hi, I have an experiment where I have a gold-standard method to calculate the concentration of a sample and two methods I want to test how well they measure the concentration and if one of them is better than the other. I have set up a concentration gradient from 0 to 5 units in breaks of 0.5 and measure each sample with each new method.
I have done an ANOVA test on the measurements obtained for each method and have found that measurements are statisticaly different between the two methods.
Then I have run a linear regression on each method to see how each method fits the gradient, and I see that one of the two methods has a higher R-squared value.
My question is, can I say based on R or R-square values that one of the methods is significantly better than the other at measuring concentration based on both the R-square value and the significance of the ANOVA test?

Thanks,

Dave



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