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
{{STATS}}
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
{{CHOOS}}
and select from the following list. Press
{{OK}}
when done. The regression formula for the fit is
displayed in Symbolic view.
5-14 Statistics