Granger causality Wald tests
+------------------------------------------------------------------+
| Equation Excluded | chi2 df Prob > chi2 |
|--------------------------------------+---------------------------|
| D2ln_gdp D2ln_cct | 5.1298 2 0.077 |
| D2ln_gdp ALL | 5.1298 2 0.077 |
|--------------------------------------+---------------------------|
| D2ln_cct D2ln_gdp | 4.1529 2 0.125 |
| D2ln_cct ALL | 4.1529 2 0.125 |
+------------------------------------------------------------------+
.