ThermalFit
the open source library JFreeChart . Thermal Fit You can download the application here . You can download the source code for both applets here. You can download a sample data set here . The applet has been [...] expected to be "Hz" or "m" or "m*m". If your data, have different units, e.g. they are scaled in kHz, you can use the xscaling or yscaling for correcting this, e.g. by using a scaling factor of 1e3. You may want [...] force constant will be calculated using Boltzmann's equipartition theorem. The results of the SHO can be seen in the third column of numbers (Amp (DC), Q, Omega0, White Noise and Force Constant), whereas