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In order to describe the dependence structure of the two relief factors of debris flow of main channel length and drainage height difference, this paper provides an ordinal sum of a class of Copulas, such that its concordance measures of Kendall's τ and Spearman's ρ being suitable for the data. The parameters in Copulas are calculated to get… (More)
We study the concordance measures Kendall's σ and Spearman's ρ of a new class of bivariate Copulas. Taking the relief factors of debris flow of drainage height difference and cutting degree for the example, we calculate the concordance measures σ and ρ of the two relief factors, with the relationship of them can be better… (More)
We study four groups of generalized FGM Copulas whose Kendall's? and Spearman's? contain nearly two parameters, with 3? = 2?, that make them describe the dependence structure of the data more flexible and accurate than FGM Copula. Taking the relief factors of drainage height difference and cutting degree for example, this paper gives four specific Copulas… (More)
The dependence of a couple of generalized FGM Copulas are studied in this paper. We solved their linear correlation coefficients r and concordance measures Kendall's τ and Spearman's ρ. Taking the relief factors of debris flow of drainage height difference and cutting degree for the examples, the concordance measures τ and ρ of… (More)