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From time to time I need to calculate the mean lag in the response of a variable to a shock in a dynamic specification, so I decided to create an excel file to do the job once and for all: Get the excel file for calculating the Mean Lag

Wynne Godley, Dimitri B. Papadimitriou, and Gennaro Zezza, “The U.S. Economy: What’s Next?”, Levy Institute of Economics, Strategic Analysis, April, 2007.

The collapse in the subprime mortgage market, along with multiple signals of distress in the broader housing market, has already drawn forth a large body of comment. Some people think the upheaval will turn out to be contagious, causing a major slowdown or even a recession later in 2007. Others believe that the turmoil will be contained, and that the U.S. economy will recover quite rapidly and resume the steady growth it has enjoyed during the last four years or so.

Yet no participants in the public discussion, so far as we know, have framed their views in the context of a formal model that enables them to draw well-argued conclusions (however conditional) about the magnitude and timing of the impact of recent events on the overall economy in the medium term—not just the next few months.

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