Latent projections

O.M. Kvalheim and Y.-Z. Liang, Heuristic evolving latent projections — resolving 2-way multicomponent data. 1. Selectivity, latent projective graph, datascope, local rank and unique resolution. Anal. Chem., 64 (1992) 936-946. 

Other Techniques Subwindow Factor Analysis (SFA) and Heuristic Evolving Latent Projections (HELP)... 

GC—gas chromatography HCA—hierarchical cluster analysis HELP—heuristic evolving latent projections HHM—horse heart myoglobin HPLC—high performance liquid chromatography HPLC-DAD—high performance liquid chromatography-diode array detector... 

Other recently developed chemometric approaches include Heuristic evolving latent projections (HELP) [162] which is primarily used for the analysis of qualitative and quantitative data from 2-dimensional data (e.g. HPLC DAD) used for complex mixtures, and HELP lessens the demand on developing complicated separation methods mixed level orthogonal array design (ML-OAD) has been used to optimise the parameters involved in HPLC detection [163]. The LC methods for determining the purity of tetracycline HCl and resolution... 

Furthermore, the NNPLS model appeared not only to retain the linear latent projections, but also introduced nonlinearity in the inner models to compensate for the shortcomings of the linear PLS algorithm. This is shown in figure 5, where the PLS inner model scores are plotted to show the shape of the curve fitted by the neural network. The output scores after the first latent dimension seem to have near linear relationships with the input scores. 

Visualization of Latent Projections. Visualization is of prime importance for interpreting multivariate data. Many plots are available. The most important are score and loading plots and their combination into biplots. 

---