scholarly journals On combinatorial rectangles with minimum ∞−discrepancy

2020 ◽  
Vol 2021 (1) ◽  
pp. Article #S2R7
Author(s):  
Chunwei Song ◽  
◽  
Bowen Yao ◽  
Keyword(s):  
2010 ◽  
Vol 2010 ◽  
pp. 1-23 ◽  
Author(s):  
Vadim E. Seleznev

The paper describes a new method for numerical monitoring of discrepancies in natural gas supply to consumers, who receive gas from gas distribution loops. This method serves to resolve the vital problem of commercial natural gas accounting under the conditions of deficient field measurements of gas supply volumes. Numerical monitoring makes it possible to obtain computational estimates of actual gas deliveries over given time spans and to estimate their difference from corresponding values reported by gas consumers. Such estimation is performed using a computational fluid dynamics simulator of gas flows in the gas distribution system of interest. Numerical monitoring of the discrepancy is based on a statement and numerical solution of identification problem of a physically proved gas dynamics mode of natural gas transmission through specified gas distribution networks. The identified mode parameters should have a minimum discrepancy with field measurements of gas transport at specified reference points of the simulated pipeline network.


Genetics ◽  
1954 ◽  
Vol 39 (5) ◽  
pp. 581-586
Author(s):  
V N Murty
Keyword(s):  

2021 ◽  
Vol 6 (2) ◽  
pp. 1-16
Author(s):  
Abdulali Ahmadi ◽  
Ali Moradi

The method employed in this study was a descriptive correlation in which two validated researcher-made questionnaires were used to collect data. The population involved 1770 university professors in the academic year 2019-2020. From the population, 240 were randomly selected. The data was analyzed using SPSS 21 and Amos 21. Pearson correlation was used to decide the relationship between variables, one-way ANOVA to compare means, Cronbach alpha to determine reliability, and factor analysis was to check the research model and substantiate construct validity. As a result, professor authority was found to have a significant negative correlation with relative deprivation. In addition, the academic status, age, and marital status of professors turned out to exert significant positive effects on their authorities. Furthermore, the chi-square minimum discrepancy value (CMIN) was equal to 523.414, the root mean square error of approximation (RMSEA) was 0.049, the root mean square of the residuals (RMR) was equal to 0.090, the minimum discrepancy per degree of freedom (CMIN/DF) in the model was 1.562, the comparative fit index (CFI) was 0.925, and finally, the parsimonious comparative fit index (PCFI) equaled 0.820. Thus, the comparative and parsimonious indices calculated to evaluate the solidarity of the constructs demonstrated that the collected data can be considered as supporting the research validity. JEL Classification Codes: I21, I23, I31, I32.


Psychometrika ◽  
2020 ◽  
Vol 85 (3) ◽  
pp. 684-715
Author(s):  
Luca Stefanutti ◽  
Debora de Chiusole ◽  
Pasquale Anselmi ◽  
Andrea Spoto

Abstract A probabilistic framework for the polytomous extension of knowledge space theory (KST) is proposed. It consists in a probabilistic model, called polytomous local independence model, that is developed as a generalization of the basic local independence model. The algorithms for computing “maximum likelihood” (ML) and “minimum discrepancy” (MD) estimates of the model parameters have been derived and tested in a simulation study. Results show that the algorithms differ in their capability of recovering the true parameter values. The ML algorithm correctly recovers the true values, regardless of the manipulated variables. This is not totally true for the MD algorithm. Finally, the model has been applied to a real polytomous data set collected in the area of psychological assessment. Results show that it can be successfully applied in practice, paving the way to a number of applications of KST outside the area of knowledge and learning assessment.


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