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Table 4 Granger test of stratum attention and macro-level economic and political factors in different stages of the reform

From: Attention to social stratification in the public discourse: An empirical study based on big data of books (1949–2008)

Period

Null hypothesis

Observation

Chi2

p value

1978–1990

fd_GDPcp is not a Granger cause of fd_LC

13

0.11

0.742

 

fd_GINI is not a Granger cause of fd_LC

13

0.85

0.356

 

fd_PDI is not a Granger cause of fd_LC

13

3.39*

0.066

 

fd_IO is not a Granger cause of fd_LC

13

12.13***

0.000

 

fd_LC is not a Granger cause of fd_GDPcp

13

0.78

0.377

 

fd_LC is not a Granger cause of fd_GINI

13

0.18

0.676

 

fd_LC is not a Granger cause of fd_PDI

13

4′4.90**

0.027

 

fd_LC is not a Granger cause of fd_IO

13

4.60**

0.032

1991–1999

fd_GDPcp is not a Granger cause of fd_LC

9

15.49***

0.000

 

fd_GINI is not a Granger cause of fd_LC

9

8.88***

0.003

 

fd_PDI is not a Granger cause of fd_LC

9

4.93**

0.026

 

fd_IO is not a Granger cause of fd_LC

9

17.11***

0.000

 

fd_LC is not a Granger cause of fd_GDPcp

9

1.28

0.258

 

fd_LC is not a Granger cause of fd_GINI

9

5.89**

0.015

 

fd_LC is not a Granger cause of fd_PDI

9

2.48

0.115

 

fd_LC is not a Granger cause of fd_IO

9

1.1

0.294

2000–2008

fd_GDPcp is not a Granger cause of fd_LC

9

0.01

0.927

 

fd_GINI is not a Granger cause of fd_LC

9

9.55**

0.002

 

fd_PDI is not a Granger cause of fd_LC

9

14.06***

0.000

 

fd_IO is not a Granger cause of fd_LC

9

0.21

0.65

 

fd_LC is not a Granger cause of fd_GDPcp

9

210.24***

0.000

 

fd_LC is not a Granger cause of fd_GINI

9

147.66***

0.000

 

fd_LC is not a Granger cause of fd_PDI

9

115.83***

0.000

 

fd_LC is not a Granger cause of fd_IO

9

55.55***

0.000

  1. (1) “fd_” denotes the first difference. (2) Based on the information criteria AIC, SBIC, and HQIC, we chose lags of 2, 2, and 1 for each period, respectively. (3) *p < 0.1, **p < 0.05, ***p < 0.01