CASTI-89 TITANIUM · CALC89
QuadReg
Fits a quadratic y=a·x^2+b·x+c to data with least squares regression. The results are stored in stat variables such as stat.RegEqn.
Syntax
QuadReg 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 ▸ QuadReg
Example
| Input | Result |
|---|---|
| QuadReg {0,1,2,3},{1,2,5,10}:stat.RegEqn | 1.0·x2+1.0 |
Typing QuadReg {0,1,2,3},{1,2,5,10}:stat.RegEqn on the home screen and pressing ENTER returns 1.0·x2+1.0.
Keystrokes on the TI-89 Titanium
2NDMATH6▶5
The same key sequence inserts QuadReg in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- QuartRegFits a quartic polynomial y=a·x^4+b·x^3+c·x^2+d·x+e to data with least squares regression.
- SinRegFits a sinusoidal model y=a·sin(b·x+c)+d to data.
- stDevPop(Returns the population standard deviation of a list.
- stDevSamp(Returns the sample standard deviation of a list.
- tIntervalComputes a t confidence interval for a population mean when σ is unknown.
- tInterval_2SampComputes a t confidence interval for the difference of two population means.
- tTestPerforms a one sample t test on a population mean when σ is unknown.
- tTest_2SampPerforms a two sample t test on the difference of two population means.