Texas Instruments TI-89 User Manual

Statistics and Data Plots

 548

 For 

 and all regression calculations, the columns that you specify for x and y 

(and optionally, Freq or Category) must have the same length.

From the Home Screen or a Program

From the Home Screen or a Program

From the Home Screen or a Program

From the Home Screen or a Program

Use the applicable command for the calculation that you want to perform. The 
commands have the same name as the corresponding Calculation Type. Refer to the 
Technical Reference module for information about each command.

 These commands perform a statistical calculation but do not automatically 

display the results. Use the 

 command to show the calculation results.

Statistical Variables

Statistical Variables

Statistical Variables

Statistical Variables

Statistical calculation results are stored to variables. To access these variables, type the 
variable name or use the VAR-LINK screen as described in Memory and Variable 

Quartic regression — Fits the data to the fourth-order 
polynomial y=ax

4

3

2

+ dx+e. You must have at least 

five data points.

•

For five points, the equation is a polynomial fit.

•

For six or more points, it is a polynomial regression.

Sinusoidal regression — Calculates the sinusoidal 
regression and updates all the system statistics variables. 
The output is always in radians, regardless of the angle 
mode setting.