Thermo Scientific NITON XL3t 500 User Manual page 196

Appendix F
Appendix F Glossary
Calibration factors
Pearson correlation
coefficient
RMS error
Appendices-xiv NITON XL3 Analyzer User's Guide
numbers, calculated from sample readings, that are used to adjust for
consistently high or consistently low readings from the XRF Analyzer
Matrix
a substance in which things are embedded or suspended.
In mining, the earthy or stony substance in which metallic ores or
crystalized minerals are found (source: Webster's Revised Unabridged
Dictionary, via dictionary.com)
a dimensionless index that ranges from -1.0 to 1.0 inclusive and reflects the
extent of a linear relationship between two data sets.
2
R
the square of the Pearson correlation coefficient.
root-mean-squared error, the square root of the arithmetic mean of squared
deviations from the mean. This number ells you how good your
approximation is. The lower the number, the better the approximation.
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