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How much should we trust differences-in-differences estimates? Quarterly Journal of Economics 119:249–75

by Marianne Bertrand, Esther Duflo, Sendhil Mullainathan, Abhijit Banerjee, Victor Chernozhukov, Michael Grossman, Jerry Hausman, Kei Hirano, Bo Honore , 2004
"... Most papers that employ Differences-in-Differences estimation (DD) use many years of data and focus on serially correlated outcomes but ignore that the resulting standard errors are incon-sistent. To illustrate the severity of this issue, we randomly generate placebo laws in state-level data on fema ..."
Abstract - Cited by 775 (1 self) - Add to MetaCart
Most papers that employ Differences-in-Differences estimation (DD) use many years of data and focus on serially correlated outcomes but ignore that the resulting standard errors are incon-sistent. To illustrate the severity of this issue, we randomly generate placebo laws in state-level data

Measuring individual differences in implicit cognition: The implicit association test

by Anthony G. Greenwald, Debbie E. McGhee, et al. - J PERSONALITY SOCIAL PSYCHOL 74:1464–1480 , 1998
"... An implicit association test (IAT) measures differential association of 2 target concepts with an attribute. The 2 concepts appear in a 2-choice task (e.g., flower vs. insect names), and the attribute in a 2nd task (e.g., pleasant vs. unpleasant words for an evaluation attribute). When instructions ..."
Abstract - Cited by 937 (63 self) - Add to MetaCart
oblige highly associated categories (e.g., flower + pleasant) to share a response key, performance is faster than when less associated categories (e.g., insect + pleasant) share a key. This performance difference implicitly measures differential association of the 2 concepts with the attribute. In 3

MACAW: Media access protocol for wireless lans

by Vaduvur Bharghavan, Alan Demers, Scott Shenker, Lixia Zhang - In In Proceedings of the ACM SIGCOMM Conference , 1994
"... In recent years, a wide variety of mobile computing devices has emerged, including portables, palmtops, and personal digit al assistants. Providing adequate network connectivity y for these devices will require a new generation of wireless LAN technology. In this paper we study media access protocol ..."
Abstract - Cited by 837 (11 self) - Add to MetaCart
-level simulations, we examine various performance and design issues in such protocols, Our analysis leads to a new protocol, MACAW, which uses an RTS-CTS-DS-DATA-ACK message exchange and includes a significantly different backoff algorithm. 1

Generating Representative Web Workloads for Network and Server Performance Evaluation

by Paul Barford, Mark Crovella , 1997
"... One role for workload generation is as a means for understanding how servers and networks respond to variation in load. This enables management and capacity planning based on current and projected usage. This paper applies a number of observations of Web server usage to create a realistic Web worklo ..."
Abstract - Cited by 933 (11 self) - Add to MetaCart
of the reference stream, the solutions we adopted, and their associated accuracy. Finally, we present evidence that Surge exercises servers in a manner significantly different from other Web server benchmarks.

Explanation of Significant Differences for the

by Epa Superfund , 2005
"... ix This explanation of significant differences, which applies to the Record of Decision Power Burst Facility and Auxiliary Reactor Area, documents a significant difference in the remedy selected in the record of decision for treatment of the waste contained in the ARA-16 radionuclide tank. The remed ..."
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ix This explanation of significant differences, which applies to the Record of Decision Power Burst Facility and Auxiliary Reactor Area, documents a significant difference in the remedy selected in the record of decision for treatment of the waste contained in the ARA-16 radionuclide tank

Community detection in graphs

by Santo Fortunato , 2009
"... The modern science of networks has brought significant advances to our understanding of complex systems. One of the most relevant features of graphs representing real systems is community structure, or clustering, i. e. the organization of vertices in clusters, with many edges joining vertices of th ..."
Abstract - Cited by 801 (1 self) - Add to MetaCart
The modern science of networks has brought significant advances to our understanding of complex systems. One of the most relevant features of graphs representing real systems is community structure, or clustering, i. e. the organization of vertices in clusters, with many edges joining vertices

A standardized set of 260 pictures: Norms for name agreement, image agreement, familiarity, and visual complexity

by Joan Gay Snodgrass, Mary Vanderwart - JOURNAL OF EXPERIMENTAL PSYCHOLOGY: HUMAN LEARNING AND MEMORY , 1980
"... In this article we present a standardized set of 260 pictures for use in experiments investigating differences and similarities in the processing of pictures and words. The pictures are black-and-white line drawings executed according to a set of rules that provide consistency of pictorial represent ..."
Abstract - Cited by 615 (1 self) - Add to MetaCart
attributes of the pictures. The concepts were selected to provide exemplars from several widely studied semantic categories. Sources of naming variance, and mean familiarity and complexity of the exemplars, differed significantly across the set of categories investigated. The potential significance of each

EDITORIAL No Significant Difference...Says

by unknown authors
"... of the meaning and importance of P values in the medical literature. As readers of the literature, many of us too often merely look at the results of a trial and take the authors at their word regarding the statistical significance of their findings. Dr. Cloft’s main point was that, as readers, we n ..."
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need to equally critically evaluate negative findings. If an author tells us that there was no significant difference between groups, should we believe it? This depends on many issues and raises the question of statistical power. P values describe the risk of making a type I error (�) (that

Performance of optical flow techniques

by J. L. Barron, D. J. Fleet, S. S. Beauchemin - INTERNATIONAL JOURNAL OF COMPUTER VISION , 1994
"... While different optical flow techniques continue to appear, there has been a lack of quantitative evaluation of existing methods. For a common set of real and synthetic image sequences, we report the results of a number of regularly cited optical flow techniques, including instances of differential, ..."
Abstract - Cited by 1324 (32 self) - Add to MetaCart
, matching, energy-based and phase-based methods. Our comparisons are primarily empirical, and concentrate on the accuracy, reliability and density of the velocity measurements; they show that performance can differ significantly among the techniques we implemented.

Africa´s Growth Tragedy: Policies and Ethnic Divisions

by William Easterly, Ross Levine - JOURNAL OF ECONOMICS , 1997
"... Explaining cross-country differences in growth rates requires not only an understanding of the link between growth and public policies, but also an understanding of why countries choose different public policies. This paper shows that ethnic diversity helps explain cross-country differences in publi ..."
Abstract - Cited by 1340 (70 self) - Add to MetaCart
Explaining cross-country differences in growth rates requires not only an understanding of the link between growth and public policies, but also an understanding of why countries choose different public policies. This paper shows that ethnic diversity helps explain cross-country differences
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