To define your own fit
Fit model | Meaning (Continued) |
|
|
Quadratic | Fits to a quadratic curve, |
| y = ax2+bx+c. Needs at least three |
| points. |
Cubic | Fits to a cubic curve, |
| y = ax3+bx2+cx+d. Needs at least |
| four points. |
Logistic | Fits to a logistic curve, |
| L |
| y = |
| 1 + |
| where L is the saturation value for |
| growth. You can store a positive |
| real value in L, |
| computed automatically. |
User | Define your own expression (in |
Defined | Symbolic view.) |
|
|
1.In Numeric view, make sure is set.
2.Display the Symbolic view.
3.Highlight the Fit expression (Fit1, etc.) for the desired data set.
4.Type in an expression and press .
The independent variable must be X, and the expression must not contain any unknown variables. Example: 1.5 ⋅ cos x + 0.3 ⋅ sinx .
This automatically changes the Fit type (S1FIT, etc.) in the Symbolic Setup view to User Defined.
Computed statisticsOne-variable
| Statistic | Definition |
|
|
|
| NΣ | Number of data points. |
| TOTΣ | Sum of data values (with their |
|
| frequencies). |
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Statistics aplet |