The Edgeworth-Cramér serles (EC series) and the Gram-Charlier series of type A (GCA series) are discussed with regard to the fitting of gas chromatographic peaks and to the determination of parameters of statistical meaning. Experimental peaks, obtained on active carbons and on a conventional packed column, are fitted with both series developed to the seventh cumu|ant coefficient. Error analysis Is reported. The fitting observed with the EC series Is of the same order as experimental precision (0.2%-0.5% with respect to the peak maximum), Is equally good for skewed peaks (skewness ~ 1), and Is In agreement with the mathematical statistical theory. The GCA series Is unable to fit very skewed peaks, demands a greater number of parameters, and Is more time consuming. © 1981, American Chemical Society. All rights reserved.
Statistical-analysis of Gas-chromatographic Peaks By the Gram-charlier Series of Type-a and the Edgeworth-cramer Series
DONDI, Francesco;BETTI, Adalberto;BLO, Gabriella;BIGHI, Corrado
1981
Abstract
The Edgeworth-Cramér serles (EC series) and the Gram-Charlier series of type A (GCA series) are discussed with regard to the fitting of gas chromatographic peaks and to the determination of parameters of statistical meaning. Experimental peaks, obtained on active carbons and on a conventional packed column, are fitted with both series developed to the seventh cumu|ant coefficient. Error analysis Is reported. The fitting observed with the EC series Is of the same order as experimental precision (0.2%-0.5% with respect to the peak maximum), Is equally good for skewed peaks (skewness ~ 1), and Is In agreement with the mathematical statistical theory. The GCA series Is unable to fit very skewed peaks, demands a greater number of parameters, and Is more time consuming. © 1981, American Chemical Society. All rights reserved.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
