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- 2018
- Working Paper
Averaging Probability Forecasts: Back to the Future
By: Robert L. Winkler, Yael Grushka-Cockayne, Kenneth C. Lichtendahl Jr. and Victor Richmond R. Jose
The use and aggregation of probability forecasts in practice is on the rise. In this position piece, we explore some recent, and not so recent, developments concerning the use of probability forecasts in decision-making. Despite these advances, challenges still exist.... View Details
Keywords: Probability Forecast; Forecast Combination; Forecast Evaluation; Decision Analysis; Forecasting and Prediction; Decision Making; Analysis
Winkler, Robert L., Yael Grushka-Cockayne, Kenneth C. Lichtendahl Jr., and Victor Richmond R. Jose. "Averaging Probability Forecasts: Back to the Future." Harvard Business School Working Paper, No. 19-039, October 2018.
- 2018
- Working Paper
Forecasting Airport Transfer Passenger Flow Using Real-Time Data and Machine Learning
By: Xiaojia Guo, Yael Grushka-Cockayne and Bert De Reyck
Problem definition: In collaboration with Heathrow Airport, we develop a predictive system that generates quantile forecasts of transfer passengers’ connection times. Sampling from the distribution of individual passengers’ connection times, the system also produces... View Details
Keywords: Quantile Forecasts; Regression Tree; Copula; Passenger Flow Management; Data-driven Operations; Forecasting and Prediction; Data and Data Sets
Guo, Xiaojia, Yael Grushka-Cockayne, and Bert De Reyck. "Forecasting Airport Transfer Passenger Flow Using Real-Time Data and Machine Learning." Harvard Business School Working Paper, No. 19-040, October 2018.
- Article
Ensembles of Overfit and Overconfident Forecasts
By: Y. Grushka-Cockayne, V.R.R. Jose and K. C. Lichtendahl
Firms today average forecasts collected from multiple experts and models. Because of cognitive biases, strategic incentives, or the structure of machine-learning algorithms, these forecasts are often overfit to sample data and are overconfident. Little is known about... View Details
Grushka-Cockayne, Y., V.R.R. Jose, and K. C. Lichtendahl. "Ensembles of Overfit and Overconfident Forecasts." Management Science 63, no. 4 (April 2017): 1110–1130.
- Article
Is it Better to Average Probabilities or Quantiles?
By: Kenneth C. Lichtendahl, Yael Grushka-Cockayne and Robert L. Winkler
We consider two ways to aggregate expert opinions using simple averages: averaging probabilities and averaging quantiles. We examine analytical properties of these forecasts and compare their ability to harness the wisdom of the crowd. In terms of location, the two... View Details
Keywords: Probability Forecasts; Quantile Forecasts; Expert Combination; Linear Opinion Pooling; Forecasting and Prediction
Lichtendahl, Kenneth C., Yael Grushka-Cockayne, and Robert L. Winkler. "Is it Better to Average Probabilities or Quantiles?" Management Science 59, no. 7 (July 2013): 1594–1611.
- 07 Jan 2019
- Research & Ideas
The Better Way to Forecast the Future
Grushka-Cockayne, that executives should adopt a similar approach when it comes to using probability forecasts of business-critical issues; for example, the likelihood that product demand will increase by a given percentage next quarter.... View Details
- April 12, 2022
- Article
Evaluation of Individual and Ensemble Probabilistic Forecasts of COVID-19 Mortality in the United States
By: Estee Y. Cramer, Evan L. Ray, Velma K. Lopez, Johannes Bracher, Andrea Brennen, Alvaro J. Castro Rivadeneira, Michael Lingzhi Li and et al.
Short-term probabilistic forecasts of the trajectory of the COVID-19 pandemic in the United States have served as a visible and important communication channel between the scientific modeling community and both the general public and decision-makers. Forecasting models... View Details
Keywords: COVID-19; Forecasting and Prediction; Health Pandemics; Mathematical Methods; Partners and Partnerships
Cramer, Estee Y., Evan L. Ray, Velma K. Lopez, Johannes Bracher, Andrea Brennen, Alvaro J. Castro Rivadeneira, Michael Lingzhi Li, and et al. "Evaluation of Individual and Ensemble Probabilistic Forecasts of COVID-19 Mortality in the United States." e2113561119. Proceedings of the National Academy of Sciences 119, no. 15 (April 12, 2022). (See full author list here.)
- Article
Quantile Evaluation, Sensitivity to Bracketing, and Sharing Business Payoffs
By: Y. Grushka-Cockayne, K. C. Lichtendahl, V.R.R. Jose and R.L. Winkler
From forecasting competitions to conditional value-at-risk requirements, the use of multiple quantile assessments is growing in practice. To evaluate them, we use a rule from the general class of proper scoring rules for a forecaster’s multiple quantiles of a single... View Details
Grushka-Cockayne, Y., K. C. Lichtendahl, V.R.R. Jose, and R.L. Winkler. "Quantile Evaluation, Sensitivity to Bracketing, and Sharing Business Payoffs." Operations Research 65, no. 3 (May–June 2017): 712–728.
- June 2015
- Supplement
Generating Higher Value at IBM (A): EPS Forecasting Model
By: Benjamin C. Esty and Scott Mayfield
This case analyzes IBM's financial performance and its capital allocation decisions over a 10-year period from 2004-2013, during which IBM returned more than $140B to shareholders through a combination of dividends and share repurchases. During this time, CEO Sam... View Details
- 2018
- Working Paper
Bayesian Ensembles of Binary-Event Forecasts: When Is It Appropriate to Extremize or Anti-Extremize?
By: Kenneth C. Lichtendahl Jr., Yael Grushka-Cockayne, Victor Richmond R. Jose and Robert L. Winkler
Many organizations face critical decisions that rely on forecasts of binary events. In these situations, organizations often gather forecasts from multiple experts or models and average those forecasts to produce a single aggregate forecast. Because the average... View Details
Keywords: Forecast Aggregation; Linear Opinion Pool; Generalized Additive Model; Generalized Linear Model; Stacking.; Forecasting and Prediction
Lichtendahl, Kenneth C., Jr., Yael Grushka-Cockayne, Victor Richmond R. Jose, and Robert L. Winkler. "Bayesian Ensembles of Binary-Event Forecasts: When Is It Appropriate to Extremize or Anti-Extremize?" Harvard Business School Working Paper, No. 19-041, October 2018.
- May 2018
- Article
Nowcasting Gentrification: Using Yelp Data to Quantify Neighborhood Change
By: Edward L. Glaeser, Hyunjin Kim and Michael Luca
Data from digital platforms have the potential to improve our understanding of gentrification and enable new measures of how neighborhoods change in close to real time. Combining data on businesses from Yelp with data on gentrification from the Census, Federal Housing... View Details
Keywords: Forecasting Models; Simulation Methods; Regional Economic Activity: Growth, Development, Environmental Issues, And Changes; Geographic Location; Local Range; Transition; Analytics and Data Science; Measurement and Metrics; Economic Growth; Forecasting and Prediction
Glaeser, Edward L., Hyunjin Kim, and Michael Luca. "Nowcasting Gentrification: Using Yelp Data to Quantify Neighborhood Change." AEA Papers and Proceedings 108 (May 2018): 77–82.
- October 2018
- Article
The Operational Value of Social Media Information
By: Ruomeng Cui, Santiago Gallino, Antonio Moreno and Dennis J. Zhang
While the value of using social media information has been established in multiple business contexts, the field of operations and supply chain management have not yet explored the possibilities it offers in improving firms' operational decisions. This study attempts to... View Details
Cui, Ruomeng, Santiago Gallino, Antonio Moreno, and Dennis J. Zhang. "The Operational Value of Social Media Information." Special Issue on Big Data in Supply Chain Management. Production and Operations Management 27, no. 10 (October 2018): 1749–1774.
- Article
Trimmed Opinion Pools and the Crowd's Calibration Problem
By: Victor Richmond R. Jose, Yael Grushka-Cockayne and Kenneth C. Lichtendahl
We introduce an alternative to the popular linear opinion pool for combining individual probability forecasts. One of the well-known problems with the linear opinion pool is that it can be poorly calibrated. It tends toward underconfidence as the crowd's diversity... View Details
Jose, Victor Richmond R., Yael Grushka-Cockayne, and Kenneth C. Lichtendahl. "Trimmed Opinion Pools and the Crowd's Calibration Problem." Management Science 60, no. 2 (February 2014): 463–475.
- February 2006 (Revised August 2006)
- Case
Kevin McCarthy and Westlake Chemical Corporation (A)
Examines forecasting earnings/performance for a commodity chemical firm during a period of high uncertainty, highlighting the combined effects of input process (natural gas), industry capacity/utilization, and cyclicality. Assuming the role of Kevin McCarthy (the top... View Details
Keywords: Risk and Uncertainty; Futures and Commodity Futures; Forecasting and Prediction; Chemicals; Chemical Industry
Riedl, Edward J. "Kevin McCarthy and Westlake Chemical Corporation (A)." Harvard Business School Case 106-049, February 2006. (Revised August 2006.)
- February 2003 (Revised October 2003)
- Case
Cable Data Systems
By: Paul W. Marshall and Todd H Thedinga
Describes the operating challenges of Cable Data Systems (CDS), a minority-owned cable installation company with a dual mission of maximizing profits and providing employment opportunities to minorities in urban markets. Following the merger of two cable installation... View Details
Keywords: Selection and Staffing; Employment; Forecasting and Prediction; Urban Scope; Cost Management; Infrastructure; Labor Unions; Demand and Consumers; Demographics; Media and Broadcasting Industry; Telecommunications Industry; Boston
Marshall, Paul W., and Todd H Thedinga. "Cable Data Systems." Harvard Business School Case 803-132, February 2003. (Revised October 2003.)
- 24 Oct 2006
- First Look
First Look: October 24, 2006
Working PapersManaging Functional Biases in Organizational Forecasts: A Case Study of Consensus Forecasting in Supply Chain Planning Authors:Rogelio Oliva and Noel Watson Abstract To date, little research has been done on managing the... View Details
Keywords: Sean Silverthorne
- June 2018
- Case
Forta Furniture: International Expansion
By: John A. Quelch and Karthik Easwar
The Forta Furniture case highlights the need to consider new market expansion to grow a firm. It demonstrates that simply doing what has always been done is not sustainable when other competitors enter the market with differentiated or potentially superior offerings.... View Details
Keywords: Market Entry and Exit; Global Range; Decision Making; Analysis; Cross-Cultural and Cross-Border Issues; Growth and Development Strategy; Brands and Branding; Expansion
Quelch, John A., and Karthik Easwar. "Forta Furniture: International Expansion." Harvard Business School Brief Case 918-547, June 2018.
- July 2014 (Revised May 2015)
- Case
Making Room for the Baby Boom: Senior Living
By: Charles F. Wu, Joseph Beyer and Arthur I. Segel
Tom Alperin's National Development has purchased a building site in affluent Wellesley, MA, and is in the process of deciding whether to build apartments, a combination of independent living and assisted living units for seniors, or perhaps even higher acuity... View Details
Keywords: Senior Living; Assisted Living; Independent Living; Property; Finance; Real Estate Industry; Boston; Massachusetts; United States
Wu, Charles F., and Joseph Beyer. "Making Room for the Baby Boom: Senior Living." Harvard Business School Case 215-003, July 2014. (Revised May 2015.)
- Article
An Integrated Decision-Making Approach for Improving European Air Traffic Management
By: Yael Grushka-Cockayne, Bert De Reyck and Zeger Degraeve
We develop a multistakeholder, multicriteria decision-making framework for Eurocontrol, the European air traffic management organization, for evaluating and selecting operational improvements to the air traffic management system. The selected set of improvements will... View Details
Keywords: Decision Making; Framework; Operations; Performance Improvement; Government Administration; Air Transportation Industry; Europe
Grushka-Cockayne, Yael, Bert De Reyck, and Zeger Degraeve. "An Integrated Decision-Making Approach for Improving European Air Traffic Management." Management Science 54, no. 8 (August 2008): 1395–1409.
- February 2006 (Revised September 2007)
- Background Note
Winner-Take-All in Networked Markets
Discusses platform structure in new networked markets, that is, whether a market that exhibits network effects will be served by a single platform or by rival platforms. Defines "platforms" and "platform structure"; describes factors that influence the odds that a... View Details
Keywords: Forecasting and Prediction; Growth Management; Network Effects; Digital Platforms; Internet and the Web
Eisenmann, Thomas R. "Winner-Take-All in Networked Markets." Harvard Business School Background Note 806-131, February 2006. (Revised September 2007.)
- 2022
- Working Paper
The Stock Market Value of Human Capital Creation
By: Matthias Regier and Ethan Rouen
We develop a measure of firm-year-specific human capital investment from publicly disclosed personnel expenses (PE) and examine the stock market valuation of this investment. Measuring the future value of PE (PEFV) based on the relation between lagged... View Details
Regier, Matthias, and Ethan Rouen. "The Stock Market Value of Human Capital Creation." Harvard Business School Working Paper, No. 21-047, October 2020. (Revised March 2022.)