Fit the yield curve and decompose it into level, slope, and curvature - the term structure's normal modes, in your browser.
Treasury and fixed-income desks need a smooth, arbitrage-free curve from a handful of quoted yields, and they need to know which factors are actually moving the curve - but the tools that do this well are expensive terminals, and a spreadsheet fit hides its residual.
This plugin fits the Nelson-Siegel-Svensson curve by exact linear least squares for the betas over a grid-searched pair of decay parameters, so it always shows its RMS residual and the implied discount-factor spine. It then decomposes a historical curve panel into its principal components by diagonalising the covariance of yield changes - the same real-symmetric eigen-solver the platform uses for structural normal modes - and classifies the top three factors as level, slope, and curvature with their exact explained-variance shares. The yields are dated inputs you supply; there is no live feed.
Paste your quoted yields or a historical panel and run it in the browser - nothing is uploaded to anyone's cloud. Save the fitted curve to a Sandbox workspace or attach it to a Worklog case.