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- 2023
- Working Paper
Design-Based Confidence Sequences: A General Approach to Risk Mitigation in Online Experimentation
By: Dae Woong Ham, Michael Lindon, Martin Tingley and Iavor Bojinov
Randomized experiments have become the standard method for companies to evaluate the performance of new products or services. In addition to augmenting managers’ decision-making, experimentation mitigates risk by limiting the proportion of customers exposed to...
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- 2023
- Article
Experimental Evaluation of Individualized Treatment Rules
By: Kosuke Imai and Michael Lingzhi Li
The increasing availability of individual-level data has led to numerous applications of individualized (or personalized) treatment rules (ITRs). Policy makers often wish to empirically evaluate ITRs and compare their relative performance before implementing them in a...
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- Article
What Evolution Can Teach Us About Innovation
By: Noubar Afeyan and Gary P. Pisano
Many people believe that the process for achieving breakthrough innovations is chaotic, random, and unmanageable. But that view is flawed, the authors argue. Breakthroughs can be systematically generated using a process modeled on the principles that drive evolution in...
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- 2017
- Working Paper
Nowcasting the Local Economy: Using Yelp Data to Measure Economic Activity
By: Edward L. Glaeser, Hyunjin Kim and Michael Luca
Can new data sources from online platforms help to measure local economic activity? Government datasets from agencies such as the U.S. Census Bureau provide the standard measures of economic activity at the local level. However, these statistics typically appear only...
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- October 2016 (Revised December 2016)
- Module Note
Strategy Execution Module 6: Evaluating Strategic Profit Performance
By: Robert Simons
This module reading demonstrates how to calculate and analyze the profit generated by different business strategies. Formulas and examples are provided to calculate profit generated by changes in market share, revenue growth, efficiency improvements, and support costs....
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- January 2013
- Case
Luotang Power: Variances Explained
By: Robert Simons and Craig Chapman
The general manager of Luotang Power, a coal-fired power plant located in central China, reviews annual results before a meeting with the board of directors. He thought the company performed well during the year and both plant availability and fuel economy had improved...
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- January 2013 (Revised March 2017)
- Teaching Note
Luotang Power: Variances Explained (Brief Case)
By: Robert Simons and Craig Chapman
The primary objective is to explore the concepts of variance analysis in performance from one year to the next and the predictability of contracting counterparts to extract value from contract positions where they can. The general manager of a coal-fired power plant...
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- November 2012
- Article
The Variance of Non-Parametric Treatment Effect Estimators in the Presence of Clustering
By: Samuel G. Hanson and Adi Sunderam
Non-parametric estimators of treatment effects are often applied in settings where clustering may be important. We provide a general methodology for consistently estimating the variance of a large class of non-parametric estimators, including the simple matching...
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- October 2004 (Revised January 2006)
- Tutorial
Introduction to Responsibility Accounting Systems
By: David F. Hawkins, V.G. Narayanan, Jacob Cohen and Michele Jurgens
Responsibility accounting systems generate financial and related nonfinancial information about the actual and planned activities of a company's responsibility centers--organizational units headed by managers responsible for a unit's performance. The principal...
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- Other Article
What Do We Know About Variance in Accounting Profitability?
By: Anita M. McGahan and Michael E. Porter
In this paper, we analyze the variance of accounting profitability among a broad cross-section of firms in the American economy from 1981 to 1994. The purpose of the analysis is to identify the importance of year, industry, corporate-parent, and business-specific...
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- Article
Variance-Minimizing Monetary Policies with Lagged Price Adjustment and Rational Expectations
By: Jerry R. Green and Seppo Honkapohja
This paper considers a macroeconomic model with rational expectations in which prices are incompletely flexible. Markets therefore fail to clear. In such a model monetary policy is not neutral. The variance of real and nominal quantities and interest rates is sensitive...
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