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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

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05 mar 2023

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's Cover Image

Journal of Data and Information Science

Volumen 8 (2023): Edición 1 (Febrero 2023)

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Categoría del artículo: Research Paper

Publicado en línea: 05 mar 2023

Páginas: 29 - 46

Recibido: 30 dic 2022

Aceptado: 04 ene 2023

DOI: https://doi.org/10.2478/jdis-2023-0003

Palabras clave
Science of Science, Bibliometrics, Difference-in-Difference, CEM, PSM, Nobel Prize

© 2023 Yurui Huang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

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 ${\bar{c}}_{i} = \frac{1}{11} \sum_{t = - 10}^{0} c_{it}$ {\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)]

Idioma:: Inglés

Calendario de la edición:: 4 veces al año
Temas de la revista:: Informática, Tecnologías de la información, Gestión de proyectos, Bases de datos y minería de datos

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