Nonhomogeneous Poisson processes (NHPPs) are often used to model recurrent events, and there is thus a need to check model fit for such models. We study the problem of obtaining exact goodness-of-fit tests for certain parametric NHPPs, using a method based on Monte Carlo simulation conditional on sufficient statistics. A closely related way of obtaining exact confidence intervals in parametri...

The Bayesian approach to hierarchical linear models has many advantages when compared with likelihood-based methods. Initially, the clear advantage has been with robust inference in small sample settings. But more recent approaches to Bayesian computations, based on Markov Chain Monte Carlo (MCMC) simulation, have vastly improved the viability of Bayesian models in practice. Many of the newer a...

This paper describes a multi-template unsupervised speaker adaptation based on HMM-Sufficient Statistics. Multiple class-dependent models based on gender and age are used to push up the adaptation performance while keeping adaptation time within few seconds with just one arbitrary utterance. Adaptation begins with the estimation of speaker‘s class from the N-best neighbor speakers using Gaussia...

In this paper, we develop a computationally efficient approach for warp factor estimation in Vocal Tract Length Normalization (VTLN). Recently we have shown that warped features can be obtained by a linear transformation of the unwarped features. Using the warp matrices we show that warp factor estimation can be efficiently performed in an EM framework. This can be done by collecting Sufficient...

A sufficient condition is obtained for the development of a finite-time singularity in a highly symmetric Euler flow, first proposed by Kida @J. Phys. Soc. Jpn. 54, 2132 ~1995!# and recently simulated by Boratav and Pelz @Phys. Fluids 6, 2757 ~1994!#. It is shown that if the second-order spatial derivative of the pressure (pxx) is positive following a Lagrangian element ~on the x axis!, then a ...

This paper provides a Cramer-Rao lower bound (CRLB) on range, cross range, speed and heading tracking accuracy for a class of maneuvering target trajectories using nonlinear noisy range and bearing measurements when both the target and the sensor platform are moving. It is assumed that there are no missing or false measurements. This analysis is valid only for single target two-dimensional trac...

The debate between “structural” and “reduced-form”approaches has generated substantial controversy in applied economics. This article reviews a recent literature in public economics that combines the advantages of reduced-form strategies –transparent and credible identi…cation –with an important advantage of structural models – the ability to make predictions about counterfactual outcomes and w...

The debate between “structural” and “reduced-form”approaches has generated substantial controversy in applied economics. This article reviews a recent literature in public economics that combines the advantages of reduced-form strategies –transparent and credible identi…cation –with an important advantage of structural models – the ability to make predictions about counterfactual outcomes and w...

This paper describes an efficient method for unsupervised speaker adaptation. This method is based on (1) selecting a subset of speakers who are acoustically close to a test speaker, and (2) calculating adapted model parameters according to the previously stored sufficient HMM statistics of the selected speakers’ data. In this method, only a few unsupervised test speaker’s data are required for...

In conventional Speaker-Identification using GMM-UBM framework, the likelihood of the given test utterance is computed with respect to all speaker-models before identifying the speaker, based on the maximum likelihood criterion. The calculation of likelihood score of the test utterance is computationally intensive, especially when there are tens of thousands of speakers in database. In this pap...