How is it possible that if steepness increases, the long term maturity yield decreases? Isn’t a steep yield curve associated with high higher long term rates?
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Perhaps if you could copy the question and vignette.
I think that probably the factor is in negative value, so an increase in the steepness factor (not the curve steepness itself), will lead to a yield reduction in 0.6030%. Double check if this is the reason of that conclusion.