This software enhances Excel's capabilities by adding data curve fitting, interpolation, and smoothing functions. The functions include polynomial fits, splines, and local regressions while the filters feature moving average, Gaussian smoothing and median filtering.

One of the key features of this software is its curve fitting functions. With polynomial fits and a versatile local regression (loess) function, users can easily analyze and visualize their data in a way that was previously unavailable with other Excel add-ins. Additionally, the software also includes a variety of interpolation functions, including linear, cubic spline, bessel, and monotonic "constrained" splines. There is also a "flexible spline" option that allows you to specify the slope at each data point.
The cubic spline function coefficients and slope can also be returned, giving users even more control over their data analysis. Furthermore, Data Curve Fit Creator Add-in includes data smoothing functions such as moving average, median filter, and a Gaussian smoothing filter, further enhancing the software's capabilities.
In addition to its powerful analysis tools, this software also includes automatic sorting and data repair functions, making it a comprehensive solution for anyone working with complex data sets. Overall, the Data Curve Fit Creator Add-in is an essential tool for anyone looking to take their data analysis in Excel to the next level.
Version 2.80: Added new separate utility for updating or repairing function links in multiple Excel Workbooks.