Results 241 to 250 of about 7,941,890 (294)

A hybrid estimator for selectivity estimation

IEEE Transactions on Knowledge and Data Engineering, 1999
Traditional sampling-based estimators infer the actual selectivity of a query based purely on runtime information gathering, excluding the previously collected information, which underutilizes the information available. Table-based and parametric estimators extrapolate the actual selectivity of a query based only on the previously collected information,
Yibei Ling, Wei Sun 0002, Naphtali Rishe, Xianjing Xiang   +3 more
openaire   +1 more source

Estimation of Variance of the Ratio Estimator

Biometrika, 1982
SUMMARY A general class of estimators of the variance of the ratio estimator is considered, which includes two standard estimators vo and v2 and approximates another estimator VH suggested by Royall & Eberhardt (1975). Asymptotic expansions for the variances and biases of the proposed estimators are obtained.
openaire   +1 more source

On the Estimation of Contrasts in Linear Estimation

Calcutta Statistical Association Bulletin, 1973
This paper examines the conditions on the coefficient matrix of the linear model under which contrasts, and contrasts alone, are estimated by contrasts.
openaire   +1 more source

Variance estimation of survey estimates calibrated on estimated control totals—An application to the extended regression estimator and the regression composite estimator

Computational Statistics & Data Analysis, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yves G. Berger, Juan Francisco Muñoz, Eric Rancourt   +2 more
openaire   +2 more sources

Estimation of the MSE matrix of the stein estimator

Canadian Journal of Statistics, 1988
Uniformly minimum-variance unbiased (UMVU) estimators of the total risk and the mean-squared-error (MSE) matrix of the Stein estimator for the multivariate normal mean with unknown covariance matrix are proposed. The estimated MSE matrix is helpful in identifying the components which contribute most to the total risk. It also contains information about
Bilodeau, M., Srivastava, M. S.
openaire   +2 more sources

Kalman-based estimator for DOA estimations

IEEE Transactions on Signal Processing, 1994
We introduce a new Kalman-based noise-subspace estimator combined with the Root-MUSIC for direction of-arrival (DOA) estimation of uncorrelated narrow-band plane waves impinging on an array of sensors. Without both a priori knowledge of the number of sources and the inflation method presented by Yang and Kaveh (1988), we show that the Kalman-based ...
Yuan-Hwang Chen, Ching-Tai Chiang
openaire   +1 more source