Root mean square error in calibration

The goodness of a calibration can be summarized by two values, the percentage of variance explained by the model and the Root Mean Square Error in Calibration (RMSEC). The former, being a normalized value, gives an initial idea about how much of the variance of the data set is captured by the model the latter, being an absolute value to be interpreted in the same way as a standard deviation, gives information about the magnitude of the error. 

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