Skip to main content

An Open Access Journal

Table 2 Summary statistics of the dataset

From: Citation counts in transportation research

Variable code

Definition

Mean

S.D.

Min

Max

Dependent variable:

CI

Citations per article

28.08

29.58

0

294

Article characteristics:

KW

Keywords

8.84

3.84

1

24

RF

References

25.96

16.73

0

167

WA

Words in abstract

158.71

61.59

0

464

WT

Words in title

10.75

3.66

1

28

Author characteristics:

ANa

Place in alphabet of first authors surname

10.96

7.18

1

26

GE

Gender (1 = female, 0 = male)

0.13

0.34

0

1

EN

Language (1 = English, 0 = not English)

0.57

0.50

0

1

NA

Number of authors (1 = more than one, 0 = one)

0.77

0.42

0

1

AC

Number of countries (1 = more than one, 0 = one)

0.20

0.40

0

1

Name of journals:

TR

Transportation

0.13

0.34

0

1

PA

Transportation Research Part A

0.27

0.44

0

1

PB

Transportation Research Part B

0.28

0.45

0

1

TS

Transportation Science

0.19

0.39

0

1

JT

Journal of Transport Economics and Policy

0.12

0.33

0

1

Publication year:

Y 2000

Publication year (1 = 2000, 0 otherwise)

0.17

0.38

0

1

Y 2001

Publication year (1 = 2001, 0 otherwise)

0.20

0.40

0

1

Y 2002

Publication year (1 = 2002, 0 otherwise)

0.22

0.41

0

1

Y 2003

Publication year (1 = 2003, 0 otherwise)

0.21

0.41

0

1

Y 2004

Publication year (1 = 2004, 0 otherwise)

0.20

0.40

0

1

  1. a Articles written by first authors whose surname begin with the letter A is given the value 1, a first author whose surname begin with the letter B is given the value 2, etc.