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Number of optimal lags

Posted: Thu Apr 11, 2019 1:24 pm
by Abdou1985
Hello, please, I'm looking for how to determine the number of optimal lags to estimate the production gap and thank you.
inflation rate=INF.
output gap=GAP
the model that I want to estimate is :
INF=INF(-1)+a1GAP+a2GAP(-1)+....+anGAP(-n)+u