Difference in Differences Analysis in Antitrust: What Does it Really Measure?

2007 ◽  
Author(s):  
John Simpson ◽  
David Schmidt
Keyword(s):  
Difference In Differences

Evaluation of the impact of public investment programs on social and economic performance of territories

2019 ◽  
pp. 109-123
Author(s):  
I. E. Limonov ◽  
M. V. Nesena
Keyword(s):  
Bayesian Modeling ◽  
Positive Impact ◽  
Public Investment ◽  
Difference In Differences ◽  
The Public ◽  
Export Activity ◽  
Regional Investment ◽  
The Difference ◽  
The Impact ◽  
Development Institution

The purpose of this study is to evaluate the impact of public investment programs on the socio-economic development of territories. As a case, the federal target programs for the development of regions and investment programs of the financial development institution — Vnesheconombank, designed to solve the problems of regional development are considered. The impact of the public interventions were evaluated by the “difference in differences” method using Bayesian modeling. The results of the evaluation suggest the positive impact of federal target programs on the total factor productivity of regions and on innovation; and that regional investment programs of Vnesheconombank are improving the export activity. All of the investments considered are likely to have contributed to the reduction of unemployment, but their implementation has been accompanied by an increase in social inequality.

The effect of the implementation of a good medical practice booklet on nursing home residents’ drug prescriptions: a difference-in-differences analysis based on data from electronic pill dispensers (Preprint)

2019 ◽  
Author(s):  
Stéphane Sanchez ◽  
Cécile Payet ◽  
Marie Herr ◽  
Anne Dazinieras ◽  
Caroline Blochet ◽  
...  
Keyword(s):  
Nursing Homes ◽  
Medical Practice ◽  
Intervention Group ◽  
Medication Use ◽  
Nursing Home Residents ◽  
Control Group ◽  
Multilevel Regression ◽  
Difference In Differences ◽  
Good Medical Practice ◽  
The Impact

BACKGROUND The elderly are particularly exposed to adverse events from medication. Among the various strategies to reduce polypharmacy, educational approaches have shown promising results. OBJECTIVE We aimed to evaluate the impact of the implementation of a good medical practice booklet on polypharmacy in nursing homes. METHODS We identified nursing homes belonging to a geriatric care provider that had launched a policy of proper medication use using a good medical practice booklet delivered to prescribers and pharmacists. Data were derived from electronic pill dispensers. The effect of the intervention on polypharmacy was assessed with multilevel regression models, with a control group to account for natural trends over time. The main outcomes were the average daily number of times when medication was administered and the number of drugs with different presentation identifier codes per resident per month. RESULTS 96,216 residents from 519 nursing homes were included between 1 January 2011 and 31 December 2014. The intervention group and the control group both decreased their average daily use of medication (-0.05 and -0.06). The good medical practice booklet did not have a statistically significant effect (exponentiated difference-in-differences coefficient 1.00, 95% confidence interval 0.99-1.02, P=.45). CONCLUSIONS Although the good medical practice booklet itself did not seem effective in decreasing medication use, our data show the effectiveness of a higher-level policy to decrease polypharmacy.

Who Should Select New Employees, Headquarters or the Unit Manager? Consequences of Centralizing Hiring at a Retail Chain

2019 ◽  
Vol 95 (4) ◽  
pp. 173-198 ◽  
Author(s):  
Carolyn Deller ◽  
Tatiana Sandino
Keyword(s):  
Data Availability ◽  
Business Unit ◽  
Difference In Differences ◽  
Decision Rights ◽  
Local Conditions ◽  
New Employees ◽  
Retail Chain ◽  
Unit Manager ◽  
Local Advantage ◽  
Retail Company

ABSTRACT We examine how changing the allocation of hiring decision rights in a multiunit organization affects employee-firm match quality, contingent on a unit's circumstances. Our research site, a U.S. retail chain, switched from a decentralized hiring model (hiring by business unit managers—in our case, store managers) to centralized hiring (in this study, by the head office). While centralized hiring can ensure that enough resources are invested in hiring people aligned with company values, it can also neglect the unit managers' local knowledge. Using difference-in-differences analyses, we find that the switch is associated with relatively higher employee departure rates and, thus, poorer matches if the business unit manager has a local advantage; that is, if the store serves repeat customers, serves a demographically atypical market, or poses higher information-gathering costs for headquarters. In these cases, the unit manager may be more informed than headquarters about which candidates best match local conditions. Data Availability: The analyses presented in this study are based on data shared by a U.S. retail company. The data are confidential, according to a nondisclosure agreement between the company and the authors.

Did the 1999 NYSE and NASDAQ Listing Standard Changes on Audit Committee Composition Benefit Investors?

2017 ◽  
Vol 92 (6) ◽  
pp. 187-212 ◽  
Author(s):  
Seil Kim ◽  
April Klein
Keyword(s):  
Financial Reporting ◽  
Audit Committee ◽  
Research Question ◽  
Reporting Quality ◽  
Audit Committees ◽  
Financial Reporting Quality ◽  
Difference In Differences ◽  
Listed Firms ◽  
Sarbanes Oxley ◽  
Independent Audit

ABSTRACT In December 1999, the SEC instituted a new listing standard for NYSE and NASDAQ firms. Listed firms were now required to maintain fully independent audit committees with at least three members. In July 2002, the U.S. Congress legislated these standards through the Sarbanes-Oxley Act. Our research question is whether all investors benefited from the 1999 new rule. Using both an event study and a difference-in-differences methodology, we find no evidence of higher market value or better financial reporting quality resulting from this rule.

scholarly journals Who Really Benefits from Consumption Tax Cuts? Evidence from a Large VAT Reform in France

2019 ◽  
Vol 11 (1) ◽  
pp. 38-63 ◽  
Author(s):  
Youssef Benzarti ◽  
Dorian Carloni
Keyword(s):  
Value Added ◽  
Consumption Tax ◽  
Difference In Differences ◽  
Firm Level ◽  
Employment Effects ◽  
Level Data ◽  
Price Effects ◽  
Firm Level Data ◽  
Material Goods ◽  
Firm Owners

This paper evaluates the incidence of a large cut in value-added taxes (VATs) for French sit-down restaurants in 2009. In contrast to previous studies, which only focus on the price effects of VAT reforms, we estimate the effects of the VAT cut on four groups: workers, firm owners, consumers, and suppliers of material goods. Using a difference-in-differences strategy on firm-level data, we find that: firm owners pocketed more than 55 percent of the VAT cut; consumers, sellers of material goods, and employees shared the remaining windfall with consumers benefiting the least; and the employment effects were limited. (JEL H22, H25, L83)

Does Board Independence Increase Firm Value? Evidence from Closed-End Funds

2019 ◽  
pp. 1-24
Author(s):  
Matthew E. Souther
Keyword(s):  
Instrumental Variables ◽  
Firm Value ◽  
Board Independence ◽  
Difference In Differences ◽  
Cross Sectional ◽  
Closed End Funds ◽  
The Impact ◽  
New Evidence

Researchers disagree about the impact of board independence on firm value. The disagreement generally stems from the endogenous nature of board appointments. I add new evidence to this discussion by using a sample of closed-end funds to document the value-enhancing effects of independent boards. Using cross-sectional, difference-in-differences, and instrumental variables techniques, I address these endogeneity concerns and find consistent evidence that board independence is associated with higher firm value.

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