Although backward valuation provides an efficient method for valuing bonds
and interest rate derivatives once a model and tree have been constructed,
we have not yet examined how we choose the parameters that determine
the interest rate tree. This process is called
fitting the tree,
and it is obviously
very important. As a starting point we want our tree to correctly price all
the actively traded securities that we have prices for. To do so we proceed in
several steps. We first choose an interest rate process, and
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