Posted by
Ferdinando Ametrano-4 on
Jul 30, 2009; 9:32am
URL: http://quantlib.414.s1.nabble.com/Rate-Inputs-to-a-piecewise-Yield-Curve-tp7711p7717.html
On Wed, Jul 29, 2009 at 3:31 PM, GL_QL<
[hidden email]> wrote:
> it often happens that a specified rate (of a deposit, future or swap) will
> create an error when bootstrapping the yield curve [...]
> Can someone explain to me where it comes from ? I don't remember having any
> mathematical condition bootstrapping a yield curve manually.
if you impose non-negative rates (the QL default) the discount curve
must be non-increasing. Improper market data can lead to increasing
curves.
E.g. 3M deposit rate of 7% (discount factor 0.983) followed by 6M
deposit rate of 3% (discount factor 0.985). Equivalent constraints
exist for zero rates, swap rates, FRA, etc
ciao -- Nando
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