CASTI-89 TITANIUM · CALC89
Logistic
Fits a logistic growth model y=c/(1+a·ℯ^(−b·x)) to data. The results are stored in stat variables such as stat.c.
Syntax
Logistic X,Y[,[Freq][,Category,Include]]
- Group
- Statistics
- Arguments
- Takes the x list, the y list and optional frequency, category and include lists.
- Availability
- Included
- Menu path
- MATH ▸ Statistics ▸ CALC ▸ Logistic
Example
| Input | Result |
|---|---|
| Logistic {0,1,2,3,4,5},{1,2,4,6,7,7.5}:stat.c | 7.78954768529 |
Typing Logistic {0,1,2,3,4,5},{1,2,4,6,7,7.5}:stat.c on the home screen and pressing ENTER returns 7.78954768529.
Keystrokes on the TI-89 Titanium
2NDMATH6▶▼×14ENTER
The same key sequence inserts Logistic in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- LogisticDFits a logistic model with an added constant d to data.
- mean(Returns the arithmetic mean of the elements of a list.
- median(Returns the median of the elements of a list.
- MedMedFits a median median line to data, a line that is resistant to outliers.
- MultRegPerforms a multiple linear regression of one y list on several x lists.
- MultRegIntervalsComputes a confidence interval for a predicted value from a multiple linear regression.
- MultRegTestsPerforms the F test and t tests of a multiple linear regression.
- OneVarComputes one variable statistics of a list, such as mean, standard deviation and quartiles.