Generalized Method of Moments Estimator Based On Semiparametric Quantile Regression Imputation

In this article, we consider an imputation method to handle missing response values based on semiparametric quantile regression estimation. In the proposed method, the missing response values are generated using the estimated conditional quantile regression function at given values of covariates. We adopt the generalized method of moments for estimation of parameters defined through a general estimation equation. We demonstrate that the proposed estimator, which combines both semiparametric quantile regression imputation and generalized method of moments, has competitive edge against some of the most widely used parametric and non-parametric imputation estimators. The consistency and the asymptotic normality of our estimator are established and variance estimation is provided. Results from a limited simulation study and an empirical study are presented to show the adequacy of the proposed method

Parameter estimation and model testing for Markov processes via conditional characteristic functions

Markov processes are used in a wide range of disciplines, including finance. The transition densities of these processes are often unknown. However, the conditional characteristic functions are more likely to be available, especially for L\'{e}vy-driven processes. We propose an empirical likelihood approach, for both parameter estimation and model specification testing, based on the conditional characteristic function for processes with either continuous or discontinuous sample paths. Theoretical properties of the empirical likelihood estimator for parameters and a smoothed empirical likelihood ratio test for a parametric specification of the process are provided. Simulations and empirical case studies are carried out to confirm the effectiveness of the proposed estimator and test.Comment: Published in at http://dx.doi.org/10.3150/11-BEJ400 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm

Reciprocal Recommendation System for Online Dating

Online dating sites have become popular platforms for people to look for potential romantic partners. Different from traditional user-item recommendations where the goal is to match items (e.g., books, videos, etc) with a user's interests, a recommendation system for online dating aims to match people who are mutually interested in and likely to communicate with each other. We introduce similarity measures that capture the unique features and characteristics of the online dating network, for example, the interest similarity between two users if they send messages to same users, and attractiveness similarity if they receive messages from same users. A reciprocal score that measures the compatibility between a user and each potential dating candidate is computed and the recommendation list is generated to include users with top scores. The performance of our proposed recommendation system is evaluated on a real-world dataset from a major online dating site in China. The results show that our recommendation algorithms significantly outperform previously proposed approaches, and the collaborative filtering-based algorithms achieve much better performance than content-based algorithms in both precision and recall. Our results also reveal interesting behavioral difference between male and female users when it comes to looking for potential dates. In particular, males tend to be focused on their own interest and oblivious towards their attractiveness to potential dates, while females are more conscientious to their own attractiveness to the other side of the line

Effects of Misinformation and Disinformation on Vaccine Hesitancy and Routine Vaccine Uptake

This literature review was conducted to identify the role misinformation and disinformation plays on the rates of vaccine hesitancy and vaccine uptake for routine immunization among the child and adult populations of the United States. Fifteen articles between 2018-2024 were extracted from PubMed and Google Scholar databases. As shelter-in-place and social distancing protocol wanes, the risk of common vaccine preventable diseases (VPDs) reemerges, especially in populations that have not kept up with routine immunization schedules. Current efforts to restore mass vaccination campaigns are underway, but do not provide the necessary modifications to include social, behavioral, and cultural factors that influence vaccine hesitancy. To address these gaps, recommendations to provide educational information on vaccine hesitancy and disinformation using the Behavioral and Social Drivers (BeSD) framework were utilized in efforts to improve on current mass vaccination campaigns and routine immunization schedules. The inclusion of the BeSD framework can benefit marginalized populations in the United States in efforts to improve vaccine uptake and overall health outcomes

Left Behind? Migration Stories of Two Women in Rural China

Women being left behind in the countryside by husbands who migrate to work has been a common phenomenon in China. On the other hand, over time, rural women’s participation in migration has increased precipitously, many doing so after their children are older, and those of a younger generation tend to start migrant work soon after finishing school. Although these women may no longer be left behind physically, their work, mobility, circularity, and frequency of return continue to be governed by deep-rooted gender ideology that defines their role primarily as caregivers. Through the biographical stories of two rural women in Anhui, this article shows that traditional gender norms persist across generations. Yingyue is of an older generation and provided care to her husband, children, and later grandchildren when she was left behind, when she participated in migration, and when she returned to her village. Shuang is 30 years younger and aspires to urban lifestyle such as living in apartments and using daycare for her young children. Yet, like Yingyue, Shuang’s priority is caregiving. Her decisions, which are in tandem with her parents-in-law, highlight how Chinese families stick together as a safety net. Her desire to earn wages, an activity much constrained by her caregiving responsibility to two young children, illustrates a strong connection between income-generation ability and identity among women of the younger generation. These two stories underscore the importance of examining how women are left behind not only physically but in their access to opportunities such as education and income-generating activity

Minimal Permutations and 2-Regular Skew Tableaux

Bouvel and Pergola introduced the notion of minimal permutations in the study of the whole genome duplication-random loss model for genome rearrangements. Let $\mathcal{F}_d(n)$ denote the set of minimal permutations of length $n$ with $d$ descents, and let $f_d(n)= |\mathcal{F}_d(n)|$. They derived that $f_{n-2}(n)=2^{n}-(n-1)n-2$ and $f_n(2n)=C_n$, where $C_n$ is the $n$-th Catalan number. Mansour and Yan proved that $f_{n+1}(2n+1)=2^{n-2}nC_{n+1}$. In this paper, we consider the problem of counting minimal permutations in $\mathcal{F}_d(n)$ with a prescribed set of ascents. We show that such structures are in one-to-one correspondence with a class of skew Young tableaux, which we call $2$-regular skew tableaux. Using the determinantal formula for the number of skew Young tableaux of a given shape, we find an explicit formula for $f_{n-3}(n)$. Furthermore, by using the Knuth equivalence, we give a combinatorial interpretation of a formula for a refinement of the number $f_{n+1}(2n+1)$.Comment: 19 page

Attribute Identification and Predictive Customisation Using Fuzzy Clustering and Genetic Search for Industry 4.0 Environments

Today´s factory involves more services and customisation. A paradigm shift is towards “Industry 4.0” (i4) aiming at realising mass customisation at a mass production cost. However, there is a lack of tools for customer informatics. This paper addresses this issue and develops a predictive analytics framework integrating big data analysis and business informatics, using Computational Intelligence (CI). In particular, a fuzzy c-means is used for pattern recognition, as well as managing relevant big data for feeding potential customer needs and wants for improved productivity at the design stage for customised mass production. The selection of patterns from big data is performed using a genetic algorithm with fuzzy c-means, which helps with clustering and selection of optimal attributes. The case study shows that fuzzy c-means are able to assign new clusters with growing knowledge of customer needs and wants. The dataset has three types of entities: specification of various characteristics, assigned insurance risk rating, and normalised losses in use compared with other cars. The fuzzy c-means tool offers a number of features suitable for smart designs for an i4 environment