Relative residuals

Residual is a measure of the calibration point distance from the calculated curve:

Residual = y_i - Y_i

where
y_i	Measured response (area or height) or amount, depending on the calibration mode.
Y_i	Predicted response or amount for level i (calculated using the curve)

The relative residual is calculated for each calibration level using the following formula:

where
y_i	Measured response (area or height) or amount
Y_i	Predicted response or amount for level i (calculated using the curve)

The relative residual is frequently reported in % units (RelResidual%). In that case the RelResidual needs to be multiplied by 100.