August 11, 2015

Modeling bivariate discrete data - paper now in print!

My paper Modeling Bimodal Discrete Data Using Conway-Maxwell-Poisson Mixture Models with co-authors Smarajit Bose, Pragya Sur and Paromita Dubey (ISI Kolkata) is finally in print in the ASA's Journal of Business & Economic Statistics. We develop a method for modeling the distribution of bimodal discrete data, such as rankings (on a 5-star scale) and even censored data.

For some mysterious reason, our paper went through two rounds of independent proofs, and hence the delay in publication. The good news is that the link (above) to the paper provides a free eprint to the first 30 downloads.

July 31, 2015

Nature Methods piece on scientific replicability/repeatability/reproducibility

Nature Methods just published our correspondence piece Clarifying the terminology that describes scientific reproducibility (co-authored with Ron Kenett). We make three points:
1. There's confusion between the terms replicability, repeatability and reproducibility, which differ in meanings across and sometimes within fields.
2. Currently, each term is defined in a specific context by giving a laundry list of "what conditions remain constant and what conditions are changed".
3. Instead: focus on generalization! By answering "what is your study trying to generalize to?" it become very clear why some conditions are held constant and others are changed. Moreover, it helps focus on the goal, strengths and limitations of the study.

July 30, 2015

New textbook: Practical Time Series Forecasting with R

Last year I co-taught the Forecasting Analytics course at the Indian School of Business together with Casey Lichtendahl from Darden School of Business. The co-teaching inspired us to collaborate on "converting" my Practical Time Series Forecasting textbook, which is based on XLMiner software, to an edition that uses R. Since several colleagues have requested such an edition, and motivated by our colleague Rob Hyndman - the guru of forecasting and creator of R forecast package - we embarked on the journey. Our new textbook is now available on Amazon (softcover and Kindle).

Practical Time Series Forecasting with R: A Hands-On Guide joins the Practical Analytics series of textbooks. It covers the same material as the latest XLMiner edition, and is suitable for beginners in R. Instructors seeking an evaluation copy, please fill the online form.

July 12, 2015

Keynote talk at TSWIM 2015: Predictive Analytics in Information Systems Research

I'll be presenting a keynote talk tomorrow, Monday 12/7/2015, on To Explain or To Predict? Predictive Analytics in Information Systems Research at the upcoming 2015 Taiwan Summer Workshop on Information Management at NTU. I will also participate in the closing panel on "Big Data and IS Research". See the full program (also attached below.)

June 10, 2015

Awarded permanent residency in Taiwan!

Yesterday was a moving day for me: I was awarded permanent residency in Taiwan, receiving the Plum Blossom Card (for senior professionals). It was especially moving because the director of Hsinchu immigration, along with a delegate of immigration officers and a TV reporter visited me at my NTHU office to award me the card in person. I was extremely touched and amazed. I learned of the intended visit only in the morning, and serendipitously my family was able to join the occasion.

The appreciation for professors and professionals in Taiwan is outstanding, as reflected by attitudes of many Taiwanese who asked me what I do. That the immigration authorities should also recognize the importance of attracting and retaining foreign researchers and professors is truly exceptional and forward-looking. This is my first such experience across the multiple countries I've lived in.