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Table 5 Regression analysis (dependent variable: citations per article, n = 774, R2 = 0.14, F-statistic: 6.33**)ab

From: Citation counts in transportation research

 

Coefficient

KW

0.409

(1.24)

RF

0.480**

(7.00)

WA

0.014

(0.85)

WT

−0.734**

(−2.64)

AN

−0.192

(−1.41)

GE

0.343

(0.12)

EN

2.053

(1.05)

NA

2.248

(0.94)

AC

8.864**

(2.60)

TR c

8.312*

(2.11)

PA c

8.282**

(2.51)

PB c

16.836**

(5.14)

TS c

12.576**

(3.86)

Y 2000 d

4.911

(1.60)

Y 2001 d

7.293*

(2.32)

Y 2002 d

8.728**

(2.80)

Y 2003 d

3.075

(0.94)

Constant

−0.246

(−0.05)

  1. aLevel of significance: * indicates p < 0.05; ** indicates p < 0.01 (two-tailed)
  2. bValues in parentheses are robust t-statistics
  3. cThe reference category is JT
  4. dThe reference year is 2004
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