Practical operation and theoretical basis of difference-in-difference regression in science of science: The comparative trial on the scientific performance of Nobel laureates versus their coauthors Cover

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Practical operation and theoretical basis of difference-in-difference regression in science of science: The comparative trial on the scientific performance of Nobel laureates versus their coauthors

Journal of Data and Information Science

Volume 8 (2023): Issue 1 (February 2023)

By: Yurui Huang, Chaolin Tian and Yifang Ma

Open Access

|Mar 2023

Figures & Tables

Visualized demonstration of the DID regression. Notation is declared in the text.

Regression results and CTA tests by applying different matching techniques_

	DID regression Model Results
Model	Model I	Model II	Model III
Matching Techniques	-	CEM	PSM

ATT	−0.1488	−0.0780	−0.1481
SE	0.0998	0.1307	0.1317

Common trend assumption	Fail	Pass	Pass
p-value	0.0999	0.6836	0.1582

Fixed Effect Controls
Individual	Yes	Yes	Yes
Year	Yes	Yes	Yes

Descriptive statistics for the entire sample (Nobel laureates and their prizewinning-work collaborators)_

	Prize year	Total #Publication	Total #Citation
Minimum	1934	10	443
Maximum	2011	1,627	194,896
Mean	1987	245.9	25,662.6
Median	1991	157	13,061
Standard deviation	18.6	266.1	31,571.4
Count	335	335	335

Matching results by applying different matching techniques_

Average citation index c¯i=111∑t=−100cit {\bar c_i} = {1 \over {11}}\sum\nolimits_{t = - 10}^0 {{c_{it}}} before prizewinning

Matching Techniques	-		CEM		PSM

Group	Control	Treated	Control	Treated	Control	Treated
Observations	227	108	80	80	84	108
Mean	4.7083	5.2350	5.0701	5.2869	5.1353	5.2350
Std. dev.	1.4886	1.5034	1.7627	1.6595	1.5821	1.5034
Minimum	0.3519	0.1997	0	0	1.3754	0.1997
Maximum	8.4902	8.2194	8.3668	8.4933	8.4902	8.2194

Statistics for the treatment effects_

	Treatment	Control	Treatment-Control
Prior	E(Y⁰¹)	E(Y⁰⁰)	E(Y⁰¹)–E(Y⁰⁰)
Posterior	E(Y¹¹)	E(Y¹⁰)	E(Y¹¹)–E(Y¹⁰)
Posterior-Prior	E(Y¹¹)–E(Y⁰¹)	E(Y¹⁰)–E(Y⁰⁰)	[E(Y¹¹)–E(Y⁰¹)]–[E(Y¹⁰)–E(Y⁰⁰)]

DOI: https://doi.org/10.2478/jdis-2023-0003 | Journal eISSN: 2543-683X | Journal ISSN: 2096-157X

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Language: English

Page range: 29 - 46

Submitted on: Dec 30, 2022

Accepted on: Jan 4, 2023

Published on: Mar 5, 2023

Published by: Chinese Academy of Sciences, National Science Library

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Science of Science,

Difference-in-Difference,

Related subjects:

Computer sciences,

Information technology,

Project management,

Databases and data mining

© 2023 Yurui Huang, Chaolin Tian, Yifang Ma, published by Chinese Academy of Sciences, National Science Library
This work is licensed under the Creative Commons Attribution 4.0 License.

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