Analyzing the data, Defining a regression model (2var), Analyzing the data -14 – HP 38g Graphing Calculator User Manual

Page 120: Defining a regression model (2var) -14

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Analyzing the Data

First enter your data and define which columns of data make

up your data set, then compute their statistical values.

You compute descriptive statistics by pressing the

key in the Numeric view.

For two-oariable (2VAR) statistics,

you must first define the regression model.

Defining a Regression Model (2VAR)

The Symbolic view includes an expression (Fitl through Fit5)

that defines the regression model, or “fit", to use for the

regression analysis of each two-variable data set.

There are three ways to select a regression model:

• Accept the default option to fit the data to a straight line.

• Select one of the available Fit options in Symbolic Setup.

• Enter your own mathematical expression in Symbolic

view. This expression will be plotted,

but it will not be fit to

the data points.

To choose the

1. In Numeric view, make sure 2VAR is set ({{2

VAR«}}).

Fit

2, Press ■ {SETUP-SYMB] to display the Symbolic Setup

view. Highlight the Fit number (SI F1T...S5FTI^ you want to

define.

3. Press

and select from the following list. Press

when done. The regression formula for the fit is

displayed in Symbolic view.

5-14 Statistics