Principal component and second generation wavelet analysis of Treasury yield curve evolution

Prices of U.S. Treasury securities vary over time and across maturities. When the market in Treasurys is sufficiently complete and frictionless, these prices may be modeled by a function time and maturity. A cross-section of this function for time held fixed is called the yield curve; the aggregate of these sections is the evolution of the yield curve. This dissertation studies aspects of this evolution. ^ There are two complementary approaches to the study of yield curve evolution here. The first is principal components analysis; the second is wavelet analysis. In both approaches both the time and maturity variables are discretized. In principal components analysis the vectors of yield curve shifts are viewed as observations of a multivariate normal distribution. The resulting covariance matrix is diagonalized; the resulting eigenvalues and eigenvectors (the principal components) are used to draw inferences about the yield curve evolution. ^ In wavelet analysis, the vectors of shifts are resolved into hierarchies of localized fundamental shifts (wavelets) that leave specified global properties invariant (average change and duration change). The hierarchies relate to the degree of localization with movements restricted to a single maturity at the base and general movements at the apex. Second generation wavelet techniques allow better adaptation of the model to economic observables. Statistically, the wavelet approach is inherently nonparametric while the wavelets themselves are better adapted to describing a complete market. ^ Principal components analysis provides information on the dimension of the yield curve process. While there is no clear demarkation between operative factors and noise, the top six principal components pick up 99% of total interest rate variation 95% of the time. An economically justified basis of this process is hard to find; for example a simple linear model will not suffice for the first principal component and the shape of this component is nonstationary. ^ Wavelet analysis works more directly with yield curve observations than principal components analysis. In fact the complete process from bond data to multiresolution is presented, including the dedicated Perl programs and the details of the portfolio metrics and specially adapted wavelet construction. The result is more robust statistics which provide balance to the more fragile principal components analysis. ^

Historiographic Metafiction and the Neo-slave Narrative: Pastiche and Polyphony in Caryl Phillips, Toni Morrison and Sherley Anne Williams

The classic slave narrative recounted a fugitive slave’s personal story condemning slavery and hence working towards abolition. The neo-slave narrative underlines the slave’s historical legacy by unveiling the past through foregrounding African Atlantic experiences in an attempt to create a critical historiography of the Black Atlantic. The neo-slave narrative is a genre that emerged following World War II and presents us with a dialogue combining the history of 1970 - 2000. In this thesis I seek to explore how the contemporary counter-part of the classic slave narrative draws, reflects or diverges from the general conventions of its predecessor. I argue that by scrutinizing our notion of truth, the neo-slave narrative remains a relevant, important witness to the history of slavery as well as to today’s still racialized society. The historiographic metafiction of the neo-slave narrative rewrites history with the goal of digesting the past and ultimately leading to future reconciliation.