MFG Regression

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Section C.5 Regression

Figure C.33. GeoGebra calculator ABC keyboard

Subsection Making a Scatterplot and Finding the Regression Line

We use GeoGebra’s FitLine command to produce a regression line.

Example C.34.

Make a scatterplot for the points $(10,12)\text{,}$ $(11,14)\text{,}$ $(12,14)\text{,}$ $(12,16)\text{,}$ $(14,20)\text{.}$ Then find the equation of the lease-squares regression line and plot it on top of the scatterplot.

We enter each of the five ordered pairs. The output history will show each labeled with a capital letter, such as $A=(10,12)\text{.}$

We do a Zoom to fit: right-click on the Graphics View (or click on the gear icon) and select Zoom to fit.

We next enter the FitLine command:

\begin{equation*} \text{fitline}(\{A,B,C,D,E\}) \end{equation*}

using the ABC keyboard shown above for the letters, the 123 keyboard (keyboard image) for the parentheses, and the f(x) keyboard (keyboard image) for the list curly braces {}.

Important: We must enter capital letters for the names of the points--GeoGebra is case-sensitive regarding labels.

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