The purpose of this report is to test the hypothesis that speakers utilize an acoustic, rather than articulatory, planning space for speech production. It has been well-documented that many speakers of American English use different tongue configurations to produce /r/ in different phonetic contexts. The acoustic planning hypothesis suggests that although the lr/ configuration varies widely in ...

The Open University's repository of research publications and other research outputs Forecast covariances in the linear multiregression dynamic model Journal Article

The Open University's repository of research publications and other research outputs Forecast covariances in the linear multiregression dynamic model Journal Article

The Open University's repository of research publications and other research outputs Forecast covariances in the linear multiregression dynamic model Journal Article

The Open University's repository of research publications and other research outputs Forecast covariances in the linear multiregression dynamic model Journal Article

Abstract Covariances between aggregate stock returns and changes in bond yields change sign over time. Existing theories emphasize either time-varying properties of expected inflation or real yields. Using revisions survey forecasts as proxies for macroeconomic news, neither approach succeeds empirically. Inflation-centric models require much more news about future than we observe from surveys....

Generalized least squares (GLS) methods provide a relatively fast means of constructing a confidence set of topologies. Because they utilize information about the covariances between distances, it is reasonable to expect additional efficiency in estimation and confidence set construction relative to other least squares (LS) methods. Difficulties have been found to arise in a number of practical...