bls.zip_bls _calibration_calibration matlab_zip

This file contains information about the data files; Pah_xy.dat, Pah_y.dat and rep_pah.dat. The data sets Pah_xy.dat and Pah_y.dat contain eight data pairs generated from the determination of eight polycyclic aromatic hydrocarbons in various environmental matrices at different concentration levels through a stepwise interlaboratory study approach. The two analytical methods being compared are GC/MS-SIM (on the x axis) and GC-ECD (on the y axis). The linear range is between zero and 6 mg/g. P. de Vogt, J. Hinschberger, E. A. Maier, B. Griepink, H. Muntau, J. Jacob, Improvements in the determination of eight polycyclic aromatic hydrocarbons through a stepwise interlaboratory study approach, Fresenius J. Anal. Chem., 356 (1996) 41-48. The file Pah_xy.dat contains a 88x2 matrix with the 11 replicate values performed by both methods in comparison for each one of the eight polycyclic aromatic hydrocarbons. The file Pah_y.dat contains a 88x2 matrix with the 11 replicate values performed only by the GC-ECD method (on the y axis). The x-axis replicate values for each one of the eight polycyclic aromatic hydrocarbons are constant and equal to the corresponding means of the replicate concentrations from Pah_xy.dat The file rep_pah.dat contains the number of replicates performed for each one of the eight polycyclic aromatic hydrocarbons analyzed (11). For more information see the paper: A. Martinez, J. Riu and F.X. Rius, Lack of fit in linear regression considering errors in both axes, Chemom. Intell. Lab. Syst, 54 (2000) 61-73.