Sorry to bother you. I am a student from University of Glasgow UK.  For my dissertation purpose I need to run Granger Causality tests using Gretl.  I am using panel data, "time series" function didn't work?  Would you mind giving me some advice on the following questions: 

How to run Granger Causality in Gretl using panel data? Do I need to change my data structure to time series in order to finish the Granger causality test of variables. 

Thank you for your time

Dianpeng