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We use interior point method to find out the betas so as to implement the Svensson model.Could anyone suggest how to test it? Is there any available dataset? Thanks.

Send my a private message with your email and we can discuss this topic in more detail. Maybe, I can provide you with test data ... I am not aware of something like a standard data set. When it comes to testing, read the paper of Bliss, "testing term structure estimation methods"