Texas Instruments Titanium TI-89 - Selecting the Calculation Type

Statistics and Data Plots 546
Selecting the Calculation Type
Selecting the Calculation TypeSelecting the Calculation Type
Selecting the Calculation Type
From the Calculate dialog box (‡), highlight the current setting for the
Calculation Type
and press B.
You can then select from a menu of available
types.
Calc Type Description
OneVar One-variable statistics — Calculates the statistical variables.
TwoVar Two-variable statistics — Calculates the statistical variables.
CubicReg Cubic regression — Fits the data to the third-order
polynomial y=ax
3
+bx
2
+cx+d. You must have at least four
data points.
• For four points, the equation is a polynomial fit.
• For five or more points, it is a polynomial regression.
ExpReg Exponential regression — Fits the data to the model
equation y=ab
x
(where a is the y-intercept) using a least-
squares fit and transformed values x and ln(y).
If an item is dimmed,
it is not valid for the
current Calculation
Type.