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Pa2 800 Series Operator's Manual
7. Perform a linear regression analysis of the duplicate pairs of results
a. The regression should be performed by a computer capable of calculating
the regression by the Deming method. The debiased slope and offset
provided by this method is the recommended process for method
comparison.
b. Compute the correction equation by setting the 800 system as the X
(independent variable) and the reference analyzer as the Y (dependent
variable).
The calculation provides the equation y = mx +b where m is the slope and b is
the offset.
NOTE:ĄĂThe calculation must be made in the manner described. The
calculation of a correction equation is the mathematical inverse of
the traditional correlation equation. Failure to calculate the regression
as described will cause the results to move further from the reference analyzer.
A less acceptable alternative is to perform the linear regression on a calculator
or computer that cannot use the Deming method. Set the 800 system as the X
variable and the reference analyzer as the Y variable.
8. Enter the slope and offset correlation values for the 800 system. Refer to
Defining Correlation Coefficients in Section 5.