期刊
COMMUNICATIONS IN STATISTICS-SIMULATION AND COMPUTATION
卷 46, 期 3, 页码 1895-1905出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/03610918.2015.1018998
关键词
Kurtosis; Robust methods; Simulation; Structural equation model
资金
- National Council for Scientific and Technological Development (CNPq)
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- FAPESP [2012/21788-2]
This work is intended to suggest modifications in the construction of the GFI index using robust methods for estimating the unrestricted sample covariance matrix, leading to new indices called GFI((MCD)) and GFI((MVE)). The validation of this proposal was made using Monte Carlo simulation methods, considering differences between the unrestricted sample covariance matrix and those imposed by the structural model, and different numbers of outliers generated by distributions with deviations from symmetry and excess kurtosis. It was concluded that for larger samples size (n >= 100), given that the outliers are from distributions that are symmetrical, the GFI((MCD)) and GFI((MVE)) present similar results, including samples with high percentages of outliers.
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