Spectral region selection

Linear Regression Baseline Fitting. This is a very simple approach to baseline correction in that it requires no effort to set up. In this method, a least squares regression line is fit to the responses in each spectral region selected for calibration. This line is then subtracted from the response values in the region before using the data to perform the calibration model calculations (Ref. 52). 

Prediction Results for PLS Calibration Models of HSA in CS II Solutions for the Spectral Regions Selected by MWPLSR and SCMWPLS... 

In many cases, band selection can be based on simple observation of the Raman spectrum combined with chemical knowledge of the system. The bands known to be providing the information can be used and the others discarded from the calibration. Most analysis packages allow some sort of manual spectral region selection. Some calibration techniques such as partial least squares (PLS, discussed later) will automatically base their prediction on only the spectral features which provide useful predictive information. Bands... 

Infrared spectra, of fats and oils, 10 823 Infrared spectral region, 19 564 Infrared spectroscopy, 14 224-243 23 136-143. See also Chromatography-infrared spectroscopy Far- infrared spectroscopy ir-selective surfaces Ir (infrared) spectroscopy Near- infrared spectroscopy Thermal analysis-infrared spectroscopy applications of, 14 239-240 23 140-141 in composition measurements, 20 682 in fiber optic fabrication, 11 138 industrial applications of, 14 240 instrumentation in, 14 225-228 23 137-138... 

The effect of sodium cyclamate (Cyc-Na) was also investigated. It was seen that there is no effect of Cyc-Na for the determination of Apt, Ace-K and Sac and Vit C to 40 ppm concentration level. So 5 ppm Cyc-Na was added to Standard sample solutions. The spectral region between 190 and 300 nm which implies woiking with 22 experimental points per spectrum was selected for analysis. In Table 33.2 the compositions of the quatemaiy mixtures employed are summarized. PLS calibrations were performed on 27 calibration spectra and, with the use of the calibration, the concentration of the samples left out during calibration was predicted. 

Accordingly the ratio vh/ d i criterion for the nature of the vibrations. In the attempted interpretation given in Table 4, the procedure was first to look for the various possible assignments on the basis of the expected spectral regions, and then to select from these those assignments in which the intensity of the bands of benzene and of the d -... 

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