Statistical Variables - Texas Instruments TI-89 Titanium User Manual

Calc Type Description
QuartReg Quartic regression — Fits the data to the fourth-order
polynomial y=ax
five data points.
•
•
SinReg 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.
For and all regression calculations, the columns that you specify for x and y
Note: TwoVar
(and optionally, Freq or Category) must have the same length.
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
Important:
display the results. Use the

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
Statistics and Data Plots
4 3
+bx +cx
For five points, the equation is a polynomial fit.
For six or more points, it is a polynomial regression.
ShowStat
2
+ dx+e. You must have at least
command to show the calculation results.
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