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. 2015 May 22;10(5):e0127298. doi: 10.1371/journal.pone.0127298

Table 7. Fixed Effects Least Squares Models: Interdisciplinarity and Citation Delay (N = 332649).

	Citation delay
	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
ln(authors)	-0.0054^***	-0.0055^***	-0.0052^***	-0.0052^***	-0.0053^***	-0.0053^***	-0.0055^***	-0.0055^***
	(0.0005)	(0.0005)	(0.0005)	(0.0005)	(0.0005)	(0.0005)	(0.0005)	(0.0005)
International	-0.0011^*	-0.0011^*	-0.0012^**	-0.0012^**	-0.0013^**	-0.0013^**	-0.0013^**	-0.0013^**
	(0.0004)	(0.0004)	(0.0004)	(0.0004)	(0.0004)	(0.0004)	(0.0004)	(0.0004)
ln(pages)	0.0158^***	0.0158^***	0.0154^***	0.0153^***	0.0140^***	0.0140^***	0.0143^***	0.0141^***
	(0.0009)	(0.0009)	(0.0009)	(0.0009)	(0.0009)	(0.0009)	(0.0009)	(0.0009)
ln(refs)	-0.0188^***	-0.0190^***	-0.0194^***	-0.0194^***	-0.0183^***	-0.0182^***	-0.0199^***	-0.0202^***
	(0.0004)	(0.0004)	(0.0005)	(0.0005)	(0.0003)	(0.0004)	(0.0006)	(0.0006)
Variety	0.0030^***	0.0034^***					0.0021^***	0.0027^***
	(0.0003)	(0.0004)					(0.0004)	(0.0004)
Variety²		0.0010^***						0.0009^***
		(0.0002)						(0.0002)
Balance			-0.0019^***	-0.0019^***			-0.0011^**	-0.0014^**
			(0.0004)	(0.0004)			(0.0004)	(0.0004)
Balance²				0.0001				0.0004^*
				(0.0002)				(0.0002)
Disparity					0.0099^***	0.0101^***	0.0094^***	0.0095^***
					(0.0004)	(0.0004)	(0.0004)	(0.0004)
Disparity²						0.0002		0.0004 ⁺
						(0.0002)		(0.0002)
Journal fixed effects	YES	YES	YES	YES	YES	YES	YES	YES
R² within	0.0163	0.0166	0.0157	0.0157	0.0227	0.0227	0.0230	0.0232
F	563^***	472^***	549^***	461^***	696^***	584^***	501^***	355^***

Cluster-robust standard errors in parentheses.

*** p<.001

** p<.01

* p<.05

⁺ p<.10.

Data sourced from Thomson Reuters Web of Science Core Collection.