Sparse Matrix Computational Techniques in Concept Decomposition Matrix Approximation

2009 ◽  
pp. 133-146
Author(s):  
Chi Shen ◽  
Duran Williams
Keyword(s):  
Sparse Matrix ◽  
Computational Techniques ◽  
Matrix Approximation ◽  
Decomposition Matrix

Sparse matrix approximation method for an active optical control system

2001 ◽  
Vol 40 (35) ◽  
pp. 6505 ◽  
Author(s):  
Timothy P. Murphy ◽  
Richard G. Lyon ◽  
John E. Dorband ◽  
Jan M. Hollis
Keyword(s):  
Control System ◽  
Approximation Method ◽  
Sparse Matrix ◽  
Optical Control ◽  
Matrix Approximation

The Impact of Missing and Error-Prone Auxiliary Information on Sparse-Matrix Sub-Population Parameter Estimates

Methodology ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 89-99 ◽  
Author(s):  
Leslie Rutkowski ◽  
Yan Zhou
Keyword(s):  
Sparse Matrix ◽  
Small Body ◽  
Auxiliary Information ◽  
Poor Quality ◽  
Quality Data ◽  
Estimation Methods ◽  
Parameter Estimates ◽  
Population Parameter ◽  
Conditioning Model ◽  
The Impact

Abstract. Given a consistent interest in comparing achievement across sub-populations in international assessments such as TIMSS, PIRLS, and PISA, it is critical that sub-population achievement is estimated reliably and with sufficient precision. As such, we systematically examine the limitations to current estimation methods used by these programs. Using a simulation study along with empirical results from the 2007 cycle of TIMSS, we show that a combination of missing and misclassified data in the conditioning model induces biases in sub-population achievement estimates, the magnitude and degree to which can be readily explained by data quality. Importantly, estimated biases in sub-population achievement are limited to the conditioning variable with poor-quality data while other sub-population achievement estimates are unaffected. Findings are generally in line with theory on missing and error-prone covariates. The current research adds to a small body of literature that has noted some of the limitations to sub-population estimation.

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