The answer on that question is so simple that I suspect that you actually mean soething else. In that case please reformulate your question.
From a regression model you get a slope estimate - you may give the deviation to 1 simply as the difference between this estimate and 1.
Hi, Jochen Wilhelm Thank you so much for your response. For example, say the equation for the regression model is y = 2.1434x - 3.255, where the slope is 2.143. Now, If I want to find how far the slope deviated from 1, how do I find that? I am a bit confused here. Please correct me If I am wrong.
2.143 - 1 = 1.143, so the slope of your regression line deviates by 1.143 from the value 1....
Or do you want to know, if the slope deviates "statistically significant" from 1 (instead of zero typically)?
Hi, Rainer Duesing Thank you for your response. Yes, I think you and Jochen Wilhelm are probably correct. I couldn't put the question correctly. I have used different methods for the same sample to measure the analytes. Now, If I want to know if the slope deviates "statistically significant" from 1 (instead of zero)," what would be the appropriate way to analyze that?
From your regression model you get the estimate (2.1434) and the standard error of the slope. From the estimate, subtract 1 (2.1434-1 = 1.1434). Divide this value by the standard error. The resulting ratio is a t value. You can get the corresponding p-value from a t-table with n-2 degrees of freedom, where n is the number of data points used to estimate the regression line.
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