TI-89

toc =//TI-89 Help Desk://=

Linear Regression Application.

 * 1) //Press Apps//
 * 2) //Choose 6:Data/Matrix// E//ditor//
 * 3) //Choose 3:New//
 * 4) //For variable enter a single lettered name and enter//
 * 5) //Enter x values in c1 and y values in c2//
 * 6) //F2:Plot setup//
 * 7) //F1:Plot type scatter, for x type c1 and for y type c2 then enter//
 * 8) //Press green diamond F2//
 * 9) //F2 to zoom//
 * 10) //A to zoomfit// (Sometimes zoomdata works better)
 * 11) //Press Apps//
 * 12) //Choose 6:Data/Matrix// //editor//
 * 13) //Choose 1:Current//
 * 14) //F5:Calc//
 * 15) //Choose Calculation type 5:LinReg//
 * 16) //For x type c1 and for y type c2//
 * 17) //select y1(x) for store RegEq enter//
 * 18) //Press green diamond F2//
 * 19) //F2 to zoom//
 * 20) //A to zoomfit// (Sometimes zoomdata works better)

If you are trying to find data outside of domain of the data points, you will need to change your x-values in the graphing window. This is:
 * 1) Green diamond
 * 2) F2
 * 3) Modify the xmin or xmax to include any quantities not currently within the domain.

Graphing Piecewise Functions:

 * when (2ndLeftMostCon, when (LeftMostCon, true, false), false)
 * the "when(" function and inequality symbols can be found in the CATALOG.

Exponential Regression Application:

 * Use the same sequence of steps as Linear Regression, but substitute step 8 subsection 1 with ExpReg. Also zoomdata works very well here.

Parametric Mode:
You should notice the change when you visit your "y=" screen.
 * Mode
 * Change the "Graph" from the default "FUNCTION" to "PARAMETRIC".

Simultaneous Mode:
This allows multiple equations typed into the "y =" screen to be graphed at the same time. While in the "y =" screen:


 * F1
 * 9: Format
 * 1) Change Graph Order to 2:SIMUL