Curve Fitting can help you to create polynomial curves, it enables you to drag data points and their error bars with your mouse and watch the best-fit polynomial curve update instantly. You choose the type of fit: linear, quadratic, cubic, or quartic.

With your mouse, drag data points and their error bars, and watch the best-fit polynomial curve update instantly. You choose the type of fit: linear, quadratic, cubic, or quartic. The reduced chi-square statistic shows you when the fit is good. Or you can try to find the best fit by manually adjusting fit parameters.

Non-obvious controls:
There is a zoom feature for all Flash simulations. Right click on the sim and select Zoom in. This can be helpful when you are using a projector or writing a lesson where you want a screen shot.
Most things on the screen are draggable: the bucket, the Chi-square graph, and the control panel (grab panel by the border)

Requirements:
* Java

The license of this software is Freeware, you can free download and free use this calculator software.