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The 6th KISS Webinar

Date: 3-4pm EST on October 20th (Wed), 2021
Zoom link: https://psu.zoom.us/j/94826638241
Speaker: Dr. Jong-Min Kim (University of Minnesota-Morris)
Title: Copula Directional Dependence and Its Applications
Abstract: By a theorem due to Sklar in 1959, a multivariate distribution can be represented in terms of its underlying margins by binding them together a copula function. Copulas are useful devices to explain the dependence structure between variables by eliminating the influence of marginals. A copula method for understanding multivariate distributions has a relatively short history in statistics literature; most of the statistical applications have arisen in the last twenty years. In this talk, copula history will be briefly introduced. The main of this talk is as follows: first, copula directional dependence capturing the direct interactions among data will be introduced. Second, for the applications of the copula direction dependence, diverse examples such as earthquakes in East Asia countries (China, Japan, Korea), China air pollution, Gene interaction, Finance will be introduced.

 

The 5th KISS Webinar

Date: 3-4pm EST on September 24th (Fri), 2021
Zoom link: https://psu.zoom.us/j/94826638241
Speaker: Dr. Hyungsuk Tak (Pennsylvania State University)
Title: Data Augmentation for Multimodality, Outliers, and Heteroscedasticity
Abstract: Data augmentation is a versatile strategy of augmenting the observed data by auxiliary variables (either latent or missing data) not only to improve the convergence speed of iterative algorithms such as EM algorithms and Gibbs-type samplers, but also to solve various problems in statistics. In this talk, I present three novel data augmentation schemes that are practically motivated to tackle multimodality, outliers, and heteroscedasticity in astronomical data analyses. For example, multimodality is a well known issue of an MCMC implementation in estimating the current expansion rate of the Universe, called the Hubble constant; outlying observations are common in measuring pulsar timing for detecting gravitational waves; and large-scale astronomical surveys always accompany with heteroscedastic measurement errors. The proposed data augmentation methods will be illustrated in the context of these astronomical problems.

 

Congratulations, Dr. Dong-Yun Kim!

Dr. Kim (our KISS Board Member) has been elected to the leadership position of the Caucus for Women in Statistics (CWS: https://cwstat.org/). CWS has just celebrated its 50th anniversary this year and is one of the societies which sponsor the Joint Statistical Meetings (JSM) along with the KISS. She will serve CWS as the President Elect in 2022 and as President in 2023.

 

KISS-sponsored sessions at JSM 2021

Invited Session #335 (Virtual)
Thu, 8/12/2021, 10:00 AM - 11:50 AM
Title: COVID-19 Stories: Voices from the Fields
Organizer: Dong-Yun Kim, National Institutes of Health)
https://ww2.amstat.org/meetings/jsm/2021/onlineprogram/ActivityDetails.cfm?SessionID=220366

Topic-contributed session #76 (Virtual)
Mon, 8/9/2021, 10:00 AM - 11:50 AM
Title: Recent Advances in Multivariate Analysis for Modern Scientific Studies and Application (organized by Yeonhee Park, University of Wisconsin)
https://ww2.amstat.org/meetings/jsm/2021/onlineprogram/ActivityDetails.cfm?SessionID=220217

Topic-contributed session #154 (Virtual)
Tue, 8/10/2021, 10:00 AM - 11:50 AM
Title: Some New Innovations in Survey Sampling and Missing Data Problems
Organizer: Sixia Chen, University of Oklahoma Health Sciences Center
https://ww2.amstat.org/meetings/jsm/2021/onlineprogram/ActivityDetails.cfm?SessionID=220450

Topic-contributed session #309 (Virtual)
Wed, 8/11/2021, 3:30 PM - 5:20 PM
Title: Statistical Advances in Source Apportionment of Air Pollutants and Source-Specific Health Effects Evaluation
Organizer: Eun Sug Park, Texas A&M Transportation Institute
https://ww2.amstat.org/meetings/jsm/2021/onlineprogram/ActivityDetails.cfm?SessionID=220380

 

Mikyoung Jun elected as ASA Fellow

Congratulations, Professor Mikyoung Jun on being elected as ASA Fellow this year!
Professor Jun has been serving as a KISS Board member, and she recently presented her work at the 2021 KISS Webinar Series. The link to her homepage is: https://sites.google.com/view/mikyoung-jun/home

 

2021 KISS Career Development Award Recipients

KISS Career Development Award recognizes statisticians in the early stages of their careers who have demonstrated outstanding productivity and the potential to make significant contributions to the field of statistics.

We are pleased to announce 2021 KISS Career Development Award winners.

The award winners will be recognized at our annual KISS meeting scheduled Monday August 9th 8PM EST. Please register (click link) if you haven't already.

Congratulations to 2021 KISS Career Development Award Recipients!

Yei Eun Shin, PhD
Winner, 2021 KISS Early Career Development Award (Prize $500)
Tenure-track Investigator
Biostatistics Branch
Division of Cancer Epidemiology & Genetics
National Cancer Institute

Junho Yang, PhD
Honorable Mention, 2021 KISS Early Career Development Award (Prize $200)
Assistant Research Fellow
Institute of Statistical Science at Academia Sinica


We would like to thank our committee members for reviewing this year's applications.

Career Development Awards Committee
Julia (Jungwha) Lee, Northwestern University Feinberg School of Medicine, Chair
Ryung Kim, Albert Einstein College of Medicine
Hee-Choon Shin, Center for Diseases and Control and Prevention
Kyunghee Song, Food and Drug Administration

Sincerely,
Korean International Statistical Society

 

2021 KISS Annual Meeting

Dear KISS members,

We are happy to hold our 2021 KISS Annual Meeting Virtually this year.
Please register below to join us on Monday August 9th, 8pm EST.
We will have several prizes for those who participate.

2021 KISS Annual (Virtual) Meeting
When: Aug 9, 2021 08:00 PM Eastern Time (US and Canada)
 
Register in advance for this meeting:
https://northwestern.zoom.us/meeting/register/tJwsdO6prj8vGNFCj8fwcglDA8tzvnF3Jhph
 
After registering, you will receive a confirmation email containing information about joining the meeting.

If you have any questions regarding the annual meeting, please email Julia Lee, 2021-22 KISS Executive Director, at jungwha-lee@northwestern.edu.

 

The 4th KISS Webinar

Date: 3-4pm EST on June 16th (Wed), 2021
Zoom link: https://psu.zoom.us/j/96312135796
Speaker: Dr. Mikyoung Jun (University of Houston)
Title: Multivariate spatio-temporal Hawkes process models of terrorism
Abstract: We develop a flexible bivariate spatio-temporal Hawkes process model to analyze pat-terns of terrorism.  Previous applications of point process methods to political violence data have mainly utilized temporal Hawkes process models, neglecting spatial variation in these attack pat-terns. This limits what can be learned from these models, as any effective counter-terrorism strategy requires knowledge on both when and where attacks are likely to occur.  Even the existing work that does exist on spatio-temporal Hawkes processes impose restrictions on the triggering function that are not well-suited for terrorism data.  Therefore, we generalize the structure of the spatio-temporal triggering function considerably, allowing for nonseparability, nonstationarity, and cross-triggering(i.e., across the groups).  To demonstrate the utility of our model, we analyze two samples of real-world terrorism data:  Afghanistan (2002-2013) and Nigeria (2010-2017).  Jointly, these two studies demonstrate that our model dramatically outperforms standard Hawkes process models,  besting widely-used alternatives in overall model fit and revealing spatio-temporal patterns that are,  by construction, masked in these models (e.g., increasing dispersion in cross-triggering over time). This is a joint work with Scott Cook.

 

The 3rd KISS Webinar

Date: 4-5pm EST on May 14th, 2021
Zoom link: https://psu.zoom.us/j/96312135796
Speaker: Dr. Hyebin Song (Pennsylvania State University)
Title: Statistical inference for high-dimensional and large-scale data with noisy labels
Abstract: In many classification applications, we are presented with data with partially observed or contaminated labels. One example of such an application is in the analysis of datasets from deep mutational scanning (DMS) experiments in proteomics, which typically do not contain non-functional sequences. In many of these settings, the problem of interest is high-dimensional where the number of features is substantially larger than the sample size. Moreover, the rate of contamination is often unavailable depending on the experimental protocols, which further complicates the downstream analysis. In this talk, I will present both parametric and semi-parametric approaches for analyzing noisy, high-dimensional binary data. I will first demonstrate that when the rate of contamination is available, the noisy label model belongs to a generalized linear model with a non-canonical link, and optimal inference is possible despite the non-convex objective. I will then present a new semi-parametric approach based on hard-thresholding for the analysis of high-dimensional noisy labels data when prior knowledge of the contamination rate is unavailable. Finally, I will present an application of our methodology to inferring sequence-function relationships and designing highly stabilized enzymes based on large-scale DMS data.

 

The 2nd KISS Webinar

Date: 4-5pm EST on April 16th, 2021 (Fri)
Zoom link: https://psu.zoom.us/j/96312135796
Speaker: Dr. Kiseop Lee (Purdue University)
Title: Data Science and Modern Financial Markets
Abstract: Since the celebrated Black-Scholes model emerged in 1973, quantitative approaches in finance have been state-of-the-art tools in financial markets. Recently, development of high frequency markets based on automated and algorithmic trading together with the boom of data science in other areas also led financial industries to adapt to this new trend. In this talk, we discuss briefly the history of quantitative finance, various machine learning tools currently used in financial markets, challenges and promises.

 

KISS Officers Condemn Anti-Asian Racism

It is disheartening to see the rise of xenophobia and racial intolerance in America in recent years. The difficulties from the pandemic and, more notably, the misinformation and false narratives spread about the COVID-19 virus certainly played a role in exacerbating anti-Asian sentiment and violence in the States. However, we recognize that racism has always been deeply rooted within the US society. The recent tragedy in Atlanta finally brought it to the attention of mainstream media; it is a tragedy and a disgrace to see such hatred on display. Our heartfelt condolences go out to victims' families, relatives and friends as they grieve the loss of their loved ones.
 
The Korean International Statistical Society (KISS) unequivocally condemns all the violence and discrimination perpetrated against the Asian Americans and Pacific Islanders (AAPI) communities. We remain committed to supporting the AAPI communities, and to working with other professional and scientific societies to cultivate a diverse, inclusive, equitable, and productive environment. We will continue to support our KISS members, our AAPI colleagues, and AAPI students to meet the challenges facing the AAPI communities and our nation.
 
MoonJung Cho, KISS President
Jae-Kwang Kim, KISS President Elect
Don Jang, KISS Past President
On behalf of KISS Officers

 

ICSA and IISA Statement on Anti-Asian Racism

Our sister societies have also made statements on anti-Asian racism, which can be accessed from the following link:


International Chinese Statistical Association (ICSA) Statement on Anti-Asian Racism

International Indian Statistical Association (IISA) Statement on Anti-Asian Racism

 

KISS Webinar Series

The first KISS webinar was held with great success. Thank you very much again for your participation! The seminar video was recorded and it is now publicly available in the following link:

https://psu.zoom.us/rec/share/ira1OPpKy7L2zO6yWRFanTxEduKpOT4Rjj7Bq2UvX_XjUzp_uSkTHRHK9ewS1hbM.tIPuEDW_sWPEpY8q?startTime=1615582911000

Speaker: Dr. Jae-Kwang Kim (Iowa State University)

Title: Statistical Inference after Kernel Ridge Regression Imputation under Item Nonresponse

Abstract: Kernel Ridge Regression (KRR) is a modern regression technique based on the theory of Reproducing Kernel Hilbert Space. We use KRR to develop imputation for handling item nonresponse. While the KRR is potentially promising for imputation, its statistical properties are not fully investigated in the literature. We first establish the root-n consistency of the KRR imputation estimators and show that it is optimal in the sense that it achieves the lower bound of the semiparametric asymptotic variance. A consistent variance estimator is also proposed by a novel application of the KRR estimator of the density ratio function. Results from a limited simulation study are also presented to confirm our theory.