Abstract The inverse square root of a covariance matrix is often desirable for performing data whitening in the process applying many common multivariate analysis methods. Direct calculation not available when either singular or nearly singular, as occurs high dimensions. We develop new methods, which we broadly call polynomial , to construct low-degree empirical has similar properties true (sh...

The aim was to characterize the effect of over-the-counter whitening strips on proteins in teeth. active ingredient is Hydrogen Peroxide.

This article addresses the impact that colored noise, temporal filtering, and temporal detrending have on the fMRI analysis situation. Specifically, it is shown why the detection of event-related designs benefit more from pre-whitening than blocked designs in a colored noise structure. Both theoretical and empirical results are provided. Furthermore, a novel exploratory method for producing dri...

Objective: This study aimed to assess the effect of different types whitening toothpastes on microhardness and surface roughness composite resins. Material Methods: 120 discshaped samples each Clearfil Majesty Esthetic Gradia Direct Anterior resins were randomly assigned 4 groups, based toothpaste used [three toothpastes: Signal White Now (SWN), Colgate Optic (COW), Ipana 3D Luxe (IWL), one non...