I want to use a yield curve using Nelson-Siegel model. I'm new to R language but decided to use the "Yield Curve" package (available here http://cran.r-project.org/web/packages/YieldCurve/index.html and documentation's link: http://cran.r-project.org/web/packages/YieldCurve/YieldCurve.pdf).
I face a problem with using new data, I already have almost the same data structure but updated, however, it is in excel file and I think I should convert it to rdata to use it?