Significance of local maxima was assessed by testing (Wilcoxon signed ranks) the distribution of voltage values at the peak of the component against the distribution of the baseline fluctuations.
The times to peaks in the waveform (implicit time) should be measured from the onset of the contrast-reversal to the peak of the component concerned; it should be noted that the highest absolute amplitude point on a waveform will not always be appropriate for the definition of the peak if there is contamination from muscle activity or other artifacts.
From a theoretical viewpoint, temporal specifications are expressed as equality or inequality constraints between delay parameters, while the qualitative specifications are expressed as an ordered pattern of the concentrations peaks of the components.
For this purpose, a peak list is generated for a given DemixC trace, which is then queried against the peak lists of the components of an NMR database, such as the metabolomics BMRB or HMDB, as implemented in the COLMAR suite of web servers (http://spinportal.magnet.fsu.edu).fsu.edu
To validate the results of the global fitting procedure (i.e. peak wavelength of the spectral components), we plotted the χ (global fitting) error as a function of the peak wavelengths of the components 1 and 2 as illustrated in Fig. 4, C E.
It is not possible to draw conclusions from the precise relative peak sizes of the components because these are dependent on a variety of environmental conditions, as well as the history and handling of samples.
Because volume conduction is extremely fast (operating at the speed of light), the peak latencies of the components must be identical for all recording sites.
The peak areas of the components in the sample were compared with those of the standards and were used for quantitative calculation.
The IF shows the TF region where the signal energy is concentrated while the IA is the amplitude envelope of each TF component; that is the magnitude of the peak of the TF component as a function of time.
Principal component analysis (PCA) was employed in the interval of 390 414 msec on the peak of the N400 component in order to estimate the number of dipoles needed to explain the difference wave.
