The easiest way to do curve fitting, forecasting, and data smoothing in Microsoft Excel...
Data Curve Fit Creator Add-in is an easy-to-use data analysis add-in for Microsoft Excel. It adds curve fitting, interpolation, and data smoothing functions to Excel. These functions work just like the standard built-in Excel functions, so they are simple to use. Curve fitting functions include polynomial fits and a versatile local regression (loess) function. Interpolations include linear, cubic spline, and a 'flexible spline' that allows you to specify the slope at each data point. Data smoothing functions include moving average, median filter, and a Gaussian smoothing filter. The software comes with full help documentation and an example workbook that demonstrates each function.
Microsoft Excel Versions Supported - Excel 2010 is fully supported (both 32 bit and 64 bit versions), as are Excel 2007, Excel 2003, Excel XP and Excel 2000.
Operating Systems Supported - Windows 7, Vista, XP, Server 2008, Server 2003, 2000.