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Im doing the Nelson Siegel model and I use de US data Treasury Yield Curve Rates monthly 1990-2010 for diferent maturity, when I run the program appears an error "near singular matrix",
this is the program I have for help

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thanks por help

I'm doing this model, the Nelson Siegel model with ten maturity, when I run the progran appears a message, "Near to singular matrix"

thanks for help