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- All HBS Web
(1,176)
- News (204)
- Research (825)
- Events (10)
- Multimedia (2)
- Faculty Publications (310)
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- October 2017 (Revised July 2018)
- Case
Data Science at Target
By: Srikant M. Datar and Caitlin N. Bowler
Paritosh Desai joined Target.com in 2013 as VP of Business Intelligence, Analytics & Testing to explore how the retailer could use its relatively small but thriving e-commerce arm to drive sales and win customers. The case explores the technological and organizational... View Details
Keywords: Data Science; Analytics and Data Science; Organizational Change and Adaptation; Competitive Strategy; Problems and Challenges; Innovation Leadership
Datar, Srikant M., and Caitlin N. Bowler. "Data Science at Target." Harvard Business School Case 118-016, October 2017. (Revised July 2018.)
- March 2020
- Article
Diagnosing Missing Always at Random in Multivariate Data
By: Iavor I. Bojinov, Natesh S. Pillai and Donald B. Rubin
Models for analyzing multivariate data sets with missing values require strong, often assessable, assumptions. The most common of these is that the mechanism that created the missing data is ignorable—a twofold assumption dependent on the mode of inference. The first... View Details
Keywords: Missing Data; Diagnostic Tools; Sensitivity Analysis; Hypothesis Testing; Missing At Random; Row Exchangeability; Analytics and Data Science; Mathematical Methods
Bojinov, Iavor I., Natesh S. Pillai, and Donald B. Rubin. "Diagnosing Missing Always at Random in Multivariate Data." Biometrika 107, no. 1 (March 2020): 246–253.
- 2020
- Working Paper
Digital Experimentation and Startup Performance: Evidence from A/B Testing
By: Rembrand Koning, Sharique Hasan and Aaron Chatterji
Recent work argues that experimentation is the appropriate framework for entrepreneurial strategy. We investigate this proposition by exploiting the time-varying adoption of A/B testing technology, which has drastically reduced the cost of experimentally testing... View Details
Keywords: Experimentation; A/B Testing; Data-driven Decision-making; Entrepreneurship; Strategy; Business Startups; Information Technology; Performance
Koning, Rembrand, Sharique Hasan, and Aaron Chatterji. "Digital Experimentation and Startup Performance: Evidence from A/B Testing." Harvard Business School Working Paper, No. 20-018, August 2019. (Revised September 2020. SSRN Working Paper Series, No. 3440291, August 2019)
- September 2022
- Article
Experimentation and Start-up Performance: Evidence from A/B Testing
By: Rembrand Koning, Sharique Hasan and Aaron Chatterji
Recent scholarship has argued that experimentation should be the organizing principle for entrepreneurial strategy. Experimentation leads to organizational learning, which drives improvements in firm performance. We investigate this proposition by exploiting the... View Details
Keywords: Experimentation; A/B Testing; Data-driven Decision-making; Organizational Learning; Entrepreneurship; Strategy; Business Startups; Learning; Performance; Decision Making
Koning, Rembrand, Sharique Hasan, and Aaron Chatterji. "Experimentation and Start-up Performance: Evidence from A/B Testing." Management Science 68, no. 9 (September 2022): 6434–6453.
- March 1987
- Article
Using Survey Data to Test Standard Propositions Regarding Exchange Rate Expectations
By: J. Frankel and K. A. Froot
Keywords: Currencies; Exchange Rates; Asset Pricing; International Macroeconomics; Monetary Policy; Currency Controls; Fixed Exchange Rates; Floating Exchange Rates; Currency Bands; Currency Zones; Currency Areas; Rational Expectations; Analytics and Data Science; Finance
Frankel, J., and K. A. Froot. "Using Survey Data to Test Standard Propositions Regarding Exchange Rate Expectations." American Economic Review 77, no. 1 (March 1987): 133–153. (Revised from NBER Working Paper No. 1672.)
- February 2021 (Revised June 2021)
- Case
Bairong and the Promise of Big Data
By: Lauren Cohen, Xiaoyan Zhang and Spencer C.N. Hagist
Bairong CEO Felix Zhang, in launching his credit scoring start-up that incorporates 74,000 variables per individual, found strong initial success. However, the shifting regulatory environment, growing breadth of competitors, difficulties in retaining top talent, and... View Details
Keywords: Fintech; Big Data; Artificial Intelligence; Credit Scoring; Finance; Credit; Business Startups; AI and Machine Learning; Analytics and Data Science; China
Cohen, Lauren, Xiaoyan Zhang, and Spencer C.N. Hagist. "Bairong and the Promise of Big Data." Harvard Business School Case 221-068, February 2021. (Revised June 2021.)
- Article
The Impact of Penalties for Wrong Answers on the Gender Gap in Test Scores
By: Katherine B. Coffman and David Klinowski
Multiple-choice exams play a critical role in university admissions across the world. A key question is whether imposing penalties for wrong answers on these exams deters guessing from women more than men, disadvantaging female test-takers. We consider data from a... View Details
Coffman, Katherine B., and David Klinowski. "The Impact of Penalties for Wrong Answers on the Gender Gap in Test Scores." Proceedings of the National Academy of Sciences 117, no. 16 (April 21, 2020): 8794–8803.
- August 2018 (Revised February 2023)
- Case
Hubble Contact Lenses: Data Driven Direct-to-Consumer Marketing
By: Jill Avery and Ayelet Israeli
As its Series A extension round approaches, the founders of Hubble, a subscription-based, social-media fueled, direct-to-consumer (DTC) brand of contact lenses, are reflecting on the marketing strategies that have taken them to a valuation of $200 million and debating... View Details
Keywords: DTC; Direct To Consumer Marketing; Health Care; Mobile; Attribution; Experimentation; Experiments; Churn/retention; Customer Lifetime Value; Internet Marketing; Big Data; Analytics; A/B Testing; CRM; Advertising; Marketing; Marketing Channels; Marketing Strategy; Media; Brands and Branding; Marketing Communications; Digital Marketing; Consumer Behavior; Acquisition; Growth and Development Strategy; Customer Focus and Relationships; Social Media; E-commerce; Analytics and Data Science; Health Industry; Consumer Products Industry; United States; North America; Europe
Avery, Jill, and Ayelet Israeli. "Hubble Contact Lenses: Data Driven Direct-to-Consumer Marketing." Harvard Business School Case 519-011, August 2018. (Revised February 2023.)
- January 2019 (Revised February 2024)
- Teaching Note
Hubble Contact Lenses: Data Driven Direct-to-Consumer Marketing
By: Ayelet Israeli
Teaching Note for HBS No. 519-011. As its Series A extension round approaches, the founders of Hubble, a subscription-based, social-media fueled, direct-to-consumer (DTC) brand of contact lenses, are reflecting on the marketing strategies that have taken them to a... View Details
Keywords: DTC; Direct To Consumer Marketing; Health Care; Mobile; Attribution; Experimentation; Experiments; Churn/retention; Customer Lifetime Value; Internet Marketing; Big Data; Analytics; A/B Testing; CRM; Advertising; Marketing; Marketing Channels; Marketing Strategy; Media; Brands and Branding; Marketing Communications; Digital Marketing; Acquisition; Growth and Development Strategy; Customer Focus and Relationships; Consumer Behavior; Social Media; E-commerce
- January 2002 (Revised April 2002)
- Case
Space Data Corporation
By: Alan D. MacCormack and Jay Wynn
Space Data Corp. plans to partner with the U.S. National Weather Service to place transceivers on weather balloons and thereby create a national mobile communications network. The company is in the late development stages and is planning to launch a regional test that... View Details
Keywords: Wireless Technology; Business Startups; Business Processes; Adaptation; Partners and Partnerships; Opportunities; Telecommunications Industry; Public Administration Industry; United States
MacCormack, Alan D., and Jay Wynn. "Space Data Corporation." Harvard Business School Case 602-121, January 2002. (Revised April 2002.)
- 11 Jan 2021
- Research & Ideas
Is A/B Testing Effective? Evidence from 35,000 Startups
Koning. Isolating the effects of A/B testing Using data available publicly through the website BuiltWith, the researchers identified companies that were up to eight years old that had installed A/B View Details
Keywords: by Kristen Senz
- March 30, 2020
- Article
Why Is the U.S. Behind on Coronavirus Testing?
By: Stefan Thomke
Coronavirus testing is needed to address the uncertainty in making decisions about patient treatment, resource allocation, policy, and so much more. Answers to questions such as “When should we relax social distancing measures—and for whom?” or “How many ventilators... View Details
Keywords: Testing; Coronavirus; Culture; Trump; Data; Experiments; Health Pandemics; Health Testing and Trials; Government and Politics; United States
Thomke, Stefan. "Why Is the U.S. Behind on Coronavirus Testing?" Harvard Business Review Digital Articles (March 30, 2020).
- Research Summary
Overcoming Large-N, Small-T Issues in Asset Pricing Tests
The large-N, small-T (i.e. large cross-section, short time series) nature of our asset data presents serious estimation problems for empirical asset pricing. In response, the literature tests asset pricing models against 10-25 test assets or portfolios. A... View Details
- March 8, 2016
- Article
Cognitive Fatigue Influences Students' Performance on Standardized Tests
By: Hans Henrik Sievertsen, F. Gino and Marco Piovesan
Using test data for all children attending Danish public schools between school years 2009–2010 and 2012–2013, we examine how the time of the test affects performance. Test time is determined by the weekly class schedule and computer availability at the school. We find... View Details
Sievertsen, Hans Henrik, F. Gino, and Marco Piovesan. "Cognitive Fatigue Influences Students' Performance on Standardized Tests." Proceedings of the National Academy of Sciences 113, no. 10 (March 8, 2016).
- 2013
- Working Paper
Testing Coleman's Social-Norm Enforcement Mechanism: Evidence from Wikipedia
By: Mikolaj J. Piskorski and Andreea Gorbatai
Since Durkheim, sociologists have believed that dense network structures lead to fewer norm violations. Coleman (1990) proposed one mechanism generating this relationship and argued that dense networks provide an opportunity structure to reward those who punish norm... View Details
Keywords: Governance Compliance; Governance Controls; Governing Rules, Regulations, and Reforms; Information Publishing; Social and Collaborative Networks; Social Issues; Societal Protocols
Piskorski, Mikolaj J., and Andreea Gorbatai. "Testing Coleman's Social-Norm Enforcement Mechanism: Evidence from Wikipedia." Harvard Business School Working Paper, No. 11-055, December 2010. (Revised September 2011, March 2013.)
- 05 Jul 2006
- Working Paper Summaries
Empirical Tests of Information Aggregation
- June 2023
- Article
National Customer Orientation: An Empirical Test across 112 Countries
By: Ofer Mintz, Imran S. Currim and Rohit Deshpandé
Customer orientation is a central tenet of marketing. However, less is known about how customer orientation varies across countries and time. Mintz, Currim, and Deshpandé (Eur. J. Mark., 56: 1014–1041, 2022) propose a country-level construct, national customer... View Details
Mintz, Ofer, Imran S. Currim, and Rohit Deshpandé. "National Customer Orientation: An Empirical Test across 112 Countries." Marketing Letters 34, no. 2 (June 2023): 189–204.
- October 2009
- Journal Article
Testing the Commitment Hypothesis in Contractual Settings: Evidence from Soccer
By: Oriol Carbonell and Diego A. Comin
This paper designs and implements an empirical test to discern whether the parties to a contract are able to commit not to renegotiate their agreement. We study optimal contracts with and without commitment and derive an exclusion restriction that is useful to identify... View Details
Carbonell, Oriol, and Diego A. Comin. "Testing the Commitment Hypothesis in Contractual Settings: Evidence from Soccer." Art. 1. Journal of Quantitative Analysis in Sports 5, no. 4 (October 2009).
- November 2019
- Article
How Do Sales Efforts Pay Off? Dynamic Panel Data Analysis in the Nerlove-Arrow Framework
By: Doug J. Chung, Byungyeon Kim and Byoung G. Park
This paper evaluates the short- and long-term value of sales representatives’ detailing visits to different types of physicians. By understanding the dynamic effect of sales calls across heterogeneous physicians, we provide guidance on the design of optimal call... View Details
Keywords: Nerlove-Arrow Framework; Stock-of-goodwill; Dynamic Panel Data; Serial Correlation; Instrumental Variables; Sales Effectiveness; Detailing; Analytics and Data Science; Sales; Analysis; Performance Effectiveness; Pharmaceutical Industry
Chung, Doug J., Byungyeon Kim, and Byoung G. Park. "How Do Sales Efforts Pay Off? Dynamic Panel Data Analysis in the Nerlove-Arrow Framework." Management Science 65, no. 11 (November 2019): 5197–5218.
- September–October 2021
- Article
Internalization of Advertising Services: Testing a Theory of the Firm
By: Alvin J. Silk, Birger Wernerfelt and Shuyi Yu
In 1956, a group of trade associations representing publishers and independent advertising agencies signed a consent decree aimed at ending a set of trade practices that for half a century effectively precluded advertisers from owning and operating in-house agencies.... View Details
Keywords: Internationalization; Specialization; Theory Of The Firm; Advertising Agencies; Advertising; Organizational Structure; Theory
Silk, Alvin J., Birger Wernerfelt, and Shuyi Yu. "Internalization of Advertising Services: Testing a Theory of the Firm." Marketing Science 40, no. 5 (September–October 2021): 946–963.