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UAI
2001
10 years 1 months ago
Policy Improvement for POMDPs Using Normalized Importance Sampling
We present a new method for estimating the expected return of a POMDP from experience. The estimator does not assume any knowledge of the POMDP, can estimate the returns for finit...
Christian R. Shelton
CLIN
2003
10 years 1 months ago
On the Statistical Consistency of DOP Estimators
A statistical estimator attempts to guess an unknown probability distribution by analyzing a sample from this distribution. One desirable property of an estimator is that its gues...
Detlef Prescher, Remko Scha, Khalil Sima'an, Andre...
VLDB
1995
ACM
135views Database» more  VLDB 1995»
10 years 3 months ago
Sampling-Based Estimation of the Number of Distinct Values of an Attribute
We provide several new sampling-based estimators of the number of distinct values of an attribute in a relation. We compare these new estimators to estimators from the database an...
Peter J. Haas, Jeffrey F. Naughton, S. Seshadri, L...
AICT
2006
IEEE
129views Communications» more  AICT 2006»
10 years 3 months ago
Stochastic Thresholding: An approach to Estimator Optimization via Fisher Information Maximization
In stochastic thresholding, the threshold for quantization of a signal is randomized. An estimator based on quantized signal data can be optimized through stochastic thresholding. ...
Samudra Dasgupta
FOCS
2003
IEEE
10 years 5 months ago
Always Good Turing: Asymptotically Optimal Probability Estimation
While deciphering the Enigma Code during World War II, I.J. Good and A.M. Turing considered the problem of estimating a probability distribution from a sample of data. They derive...
Alon Orlitsky, Narayana P. Santhanam, Junan Zhang
HYBRID
2005
Springer
10 years 5 months ago
Existence of Cascade Discrete-Continuous State Estimators for Systems on a Partial Order
In this paper, a cascade discrete-continuous state estimator on a partial order is proposed and its existence investigated. The continuous state estimation error is bounded by a mo...
Domitilla Del Vecchio, Richard M. Murray
HICSS
2006
IEEE
118views Biometrics» more  HICSS 2006»
10 years 5 months ago
An Estimator of Propagation of Cascading Failure
— We suggest a statistical estimator to measure the extent to which failures propagate in cascading failures such as large blackouts. The estimator is tested on a saturating bran...
Ian Dobson, Kevin R. Wierzbicki, Benjamin A. Carre...
ICC
2007
IEEE
10 years 6 months ago
Non-Data Aided Symbol Timing Estimation in MIMO Systems
—We present two Maximum Likelihood (ML) based estimators for Non-Data-Aided (NDA) symbol timing recovery in MIMO systems. These estimators are based on the classical Unconditiona...
Ketan Rajawat, Ajit K. Chaturvedi
CDC
2008
IEEE
125views Control Systems» more  CDC 2008»
10 years 6 months ago
Estimation of non-stationary Markov Chain transition models
— Many decision systems rely on a precisely known Markov Chain model to guarantee optimal performance, and this paper considers the online estimation of unknown, nonstationary Ma...
Luca F. Bertuccelli, Jonathan P. How
ICASSP
2009
IEEE
10 years 6 months ago
Shrinkage estimation of high dimensional covariance matrices
We address covariance estimation under mean-squared loss in the Gaussian setting. Specifically, we consider shrinkage methods which are suitable for high dimensional problems wit...
Yilun Chen, Ami Wiesel, Alfred O. Hero
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