1

2

3

4

5

6

7

8

VIF

1) Help vote

1

2) Response periods

−0.066**

1

1.070

3) Rating

−0.161*

−0.082**

1

1.180

4) Photo

0.165**

0.168**

0.117**

1

1.290

5) Length

0.196**

−0.175**

−0.077**

0.439**

1

2.080

6) Textual sentiments

0.080**

−0.168**

0.222**

0.343**

0.637**

1

1.930

7) History review

0.014

0.145**

−0.082**

−0.045**

−0.016

−0.060**

1

1.030

8) Anonymity

0.003

0.016

−0.064**

0.039**

0.030**

−0.010

−0.017

1

1.010