Perform some nonlinearity tests and draw the conclusion


Because of the existence of inverted yield curves in the term structure of interest rates, the spread of interest rates should be nonlinear. To verify this, consider the weekly U.S. interest rates of (a) Treasury 1-year constant maturity rate, and (b) Treasury 3-year constant maturity rate. As in Chapter 2, denote the two interest rates by r1t and r3t, respectively, and the data span is from January 5, 1962 to September 10, 1999. The data are in files w-gs3yr.txt and w-gs1yr.txt on the Web and can be obtained from the Federal Reserve Bank of St. Louis.

(a) Let st = r3t - r1t be the spread in log interest rates. Is {st} linear? Perform some nonlinearity tests and draw the conclusion using the 5% significance level.

(c) Build a threshold model for the st series and check the fitted model.

(d) Build a threshold model for the  series and check the fitted model.

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Financial Management: Perform some nonlinearity tests and draw the conclusion
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