Obryan Poyser Calderón

Senior Data Scientist

PepsiCo

Biography

Hi there! I am Obryan Poyser Calderón, during the past years I’ve been part of data-driven solutions for start-ups, multinational companies, and public and NGO institutions. Having a hybrid perspective from research/academia and private sector roles, allowed me to develop a detail-oriented mindset aiming for actions that add business value while being fast and anticipating future events. My areas of expertise involve Time Series Forecast and Inference, Machine Learning, and Econometrics.

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Education

Ph.D. in Applied Economics, 2019

Autonomous University of Barcelona
M.Sc. in Applied Research in Economics and Business, 2016

Autonomous University of Barcelona
B.Sc. in Economics, 2013

National University of Costa Rica

Recent Posts

Why robust regression?

For every researcher there is that moment when we question ourself of how much our findings could hold if we relax one or more assumptions. Specially in economics where we breath and eat regressions.

Sep 2, 2019 1 min read Statistics, R-Language

My early thoughts on Atomic Habits

The past weekend I started to read Atomic Habits by James Clear, it has been quite nice so far, but I mean, after checking out several articles on behavior-related issues and decision making, there is little margin for a surprise.

Apr 8, 2019 1 min read Book review

Optimal lag length in VAR models

Recently, I have been playing with vector autoregressive models. During the model specification and “sanity checks” one has to choose model order, that is, how many LHS lags introduce in the multi-equation model.

Mar 19, 2019 2 min read Statistics

What is to be rational?

This afternoon I was reading a book about rationality in voting behavior called “An economic theory of political action in a democracy”[@downs1957economic]. An amazing work (so far), for sure I do not discard that it’s likely I’ve a biased position regarding the application and precision of rational models in economics.

Oct 23, 2018 2 min read Economics

How to cope with the media bias in the news market?

In the new age of information, the common wisdom dictates that people acquire and validate cues that endorse their prejudices. Nonetheless, it is likely that information providers were aware of such behavior even from the times when the print press was invented, taking advance to maximize the probability of inflicting influence in the society.

Sep 4, 2018 3 min read Economics

Contact

opoyserc@gmail.com
Barcelona, Spain,
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