Determination coefficient

The determination coefficient (R²) is calculated as follows:

where

	R²	Determination coefficient
	ȳ	Mean values of the measured responses or amounts If the calibration curve is forced through the origin (Origin=Force in the processing method), OpenLab CDS calculates the uncentered determination coefficient. In this case, ӯ is omitted.
	yi	Measured response or amount. Response can be area (Area, Area%, or AreaRatio (ISTD method)) or height (Height, Height%, or HeightRatio (ISTD method)). Amount can be absolute amount or AmountRatio (ISTD method). The type of value depends on the calibration mode.
	Yi	Predicted response or amount (using the calibration curve)