This panel allows you to set up the model for least-squares fits. A general fitting function, or "model" is the sum of up to 22 sub-functions, each with 3 or 4 independent fitting parameters. Select the number of types of functions to be added. For each one in the list, select the actual function to be used with the drop-down menu. Then click on "Construct" to bring up the "Fit Parameter Panel" from which you control the actual fitting process. The Fit Message area at the bottom of the panel is used primarily for feedback on what happened in the course of a particular fit--whether the fit succeeded, what if an problems were encountered, etc..

Although you will certainly want to play around with least-squares fits on your own, it is strongly suggested that you read the Fit Help documentation (under the Help Menu) before doing anything that you plan to show to others!

  • Number of Functions: This drop-down menu allows you to select how many sub-models you will use, from 1 to 22.
  • Function Selection: Each menu below the top one allows you to select a particular sub-function.
  • Construct Button: When you have your model set up the way you want it, click on this button to bring up the Fit Parameter Panel.
  • Save Environment: This option allows you to save everything about your current fit model environment, including the models used and the values of the parameters, in a file for subsequent use. This can be useful if you are fitting many data files to the same model (perhaps quite complicated with many parameters) and you want to start the same place every time. Clicking this button brings up a dialog box that allows you to select a name and location from the file.
  • Restore Environment: This option restores the previously saved fit environment. Clicking the button brings up a dialog box that allows you to select the file you want.