I want to test if the level of household debts have an association with an negative interest rate. And would be very thankful if someone could guide me to wich type of timeseries test i should use.

My data contains timeserie of 2006q1 to 2016q2 houshold debt for european countries and the level of the interest rate for each country.

i want to do a timeserie analysis, but im new at this topic.

can someone guide me wich type of test i should do to see if there is an association between the rising household debts and the negative interest rates among countries in europe?

Is it possible to do a ARIMA or should i do a VAR, or something else?

( im using stata)

Best regards