Hi Prof/ collegues,
My linear regression has R^2 = 0.9554 in seafood matrix for trace metal analysis. I am looking for a specific guideline to cite the work but unable to find anything. Is the determination coefficient is accetaple for diluted acid extraction analysis using an ion chromatography-ICP-MS technique calibrated by standard addition with internal standardisation dilution curve? Please advice me.
In a general way R^2 is a function of the number of points you Work. That say someting about this you have to do a statistical hypothesys test. For example R^2=0.9 is not good for 3 points but is excelent if you have 20 points.
I believe there are no standard guidelines for r2. However, in analytical chemistry above 0.9 is considered good, and above 0.95 is preferable
it is a topic open to discuss actually. if you have 5 points with a r2 of lets say 0.91 it is not great. but 10 points with the same value is just ok like Silas mentioned above. also it is usually an overlooked issue that r2 value of 1; it is not natural and if you have 1, you have to consider re-visiting your analysis since it is as unacceptable as 0.90. because, in fact, the calibration plot (between upper and lower LOQ) is not a perfect line, it is just a fraction of a curve.
also there are "always" noises and deviations.
regards
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