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RISS 인기검색어
- 검색키워드
- 저자 : Mukherjee Saikat (검색결과 3 건)
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Construction of bivariate asymmetric copulas
Mukherjee, Saikat,Lee, Youngsaeng,Kim, Jong-Min,Jang, Jun,Park, Jeong-Soo The Korean Statistical Society 2018 Communications for statistical applications and me Vol.25 No.2
Copulas are a tool for constructing multivariate distributions and formalizing the dependence structure between random variables. From copula literature review, there are a few asymmetric copulas available so far while data collected from the real world often exhibit asymmetric nature. This necessitates developing asymmetric copulas. In this study, we discuss a method to construct a new class of bivariate asymmetric copulas based on products of symmetric (sometimes asymmetric) copulas with powered arguments in order to determine if the proposed construction can offer an added value for modeling asymmetric bivariate data. With these newly constructed copulas, we investigate dependence properties and measure of association between random variables. In addition, the test of symmetry of data and the estimation of hyper-parameters by the maximum likelihood method are discussed. With two real example such as car rental data and economic indicators data, we perform the goodness-of-fit test of our proposed asymmetric copulas. For these data, some of the proposed models turned out to be successful whereas the existing copulas were mostly unsuccessful. The method of presented here can be useful in fields such as finance, climate and social science.
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Electoral alliance with sworn opponent political party: factors impacting voting intention
Saikat Banerjee,Paroma Mitra Mukherjee 서울대학교행정대학원 2019 Asian Journal of Political Science Vol.27 No.1
Alliance with sworn political opponents is becoming a growing phenomenon within the realm of political alliances. Here, two or more competitive political parties join hands to defeat a particular common opponent. During election, alliance partners face election together and distribute electoral seats mutually to avoid vote share. However, ensuring vote in favour of opponent alliance candidate is only possible when voters prefer to cast vote for the alliance candidate. Thus, this is crucial to know influencing factors that shape voters’ voting intention in favour of opponent alliance candidate. This study is an attempt to empirically investigate factors that have significant influence to shape voters’ voting intention for opponent alliance. The result shows that opponent alliance perceived fit impacts opponent alliance voting intention positively. Opponent alliance brand trust has a positive impact on opponent alliance voting intention. In addition, opponent alliance preference impacts opponent alliance voting intention positively.
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Verma Sandeep Kumar,Gantait Saikat,Mukherjee Epsita,Gurel Ekrem 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.5
Lycium barbarum (Solanaceae), commonly known as Goji (or wolfberry), is popular for its nutritive and medicinal properties and is called a “super fruit” or “super food”. Considering the importance of the economic utility, the potential of different explants (hypocotyl, leaf and root) of L. barbarumfor plant regeneration and somatic embryogenesis has been evaluated in the present study. Two sets of experiments were carried out; the first compared Murashige and Skoog (MS) medium suplemented with different concentrations of 2,4-dichlorophenoxy acetic acid (2,4-D), N6- benzylaminopurine (BAP), thidiazuron (TDZ), kinetin, and zeatin alone, while the second set tested the combinations of TDZ with 2,4-D to inducecallus and subsequent shoot or embryo formation, respectively. For callus and subsequent shoot induction (for the first set of experiment), 2,4-D was the most effective for callus induction (100%), while TDZ at 1 mg/L produced a mean of 5 shoots per callus. For the second set of experiment spontaneous induction of somatic embryos as well as subsequent maximum shoot regeneration was recorded as 0.25 mg/L 2,4-D and 1 mg/L TDZ supplemented medium. Hypocotyl explant proved to be the most responsive organ that induced as many as 6 somatic embryos and subsequent 9regenerated shoots per callus. Later, the plantlets were successfully acclimatized (100%) and finally transferred to the greenhouse. Total phenolic content was measured from shoot, brown callus and white callus of L. barbarum L. grown in MS medium supplemented with auxin alone (for callus) and auxin-cytokinin (for shoots). The highest amount of total phenolic content (640 mg GAE/g DW) was obtained in shoot. The described protocol provides a simple way to regenerate plants through direct and indirect organogenesis as well as somatic embryogenesis, which would be useful for mass propagation, large-scale production of secondary metabolites, germplasm conservation, and genetic transformation studies in this medicinally important species.
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