=== Example : ===

[[http://www.kansascityfed.org/PUBLICAT/ECONREV/PDF/10q2Davig_Hakkio.pdf|What is the effect of financial stress on economic activity ?]],  Troy Davig and Craig Hakkio (2010)

[[attachment:DH10.mod]]

[[attachment:DavigHakkio10.mat]]

Some differences with their paper :
 * Instead of using the Chicago Fed National Activity Index (CFNAI), the MOD file considers the log of the interpolated monthly real GDP (constructed using the Chow-Lin procedure, 1971). Three monthly series used in the procedure : industrial production index, real personal consumption expenditures and all employees: total nonfarm.

 * The coefficients b_{11} and b_{22} are considered constant in Davig and Hakkio (2010) whereas in the MOD file, they follow the markov switching process.