When you enter the Regression app, you must type your data in a two-column table. You can add up to 3 data tables.
Once you have entered your data in the table, you can plot a linear regression.
You then see the points that represent your data as well as the regression line that fits the model equation $. The and coefficients are displayed in the banner at the bottom of the screen.
Once you have typed your data into the table in the Data tab, you can display the statistical variables: mean, standard deviation, median,…
You then see the table of statistical variables.
You can delete a row from the table by selecting a cell in that row and pressing DEL.
You can change the content of a cell by selecting it and typing a new value with the keyboard.
You can delete all the values in a column of the table.
Clearing the column also clears the column.
Clearing the column fills this column with the value .
You can create a column of the data table using a formula involving another column.
X1/2in the text field at the bottom of the screen. Then press OK.
To enter a capital letter, press shift then alpha then the letter to display.
You can move the cursor using the four directional arrows:
You can look for a specific point on the regression line knowing its abscissa or ordinate: that is, you can predict a value of given and a value of given .
The cursor has moved to the desired point. You can read the coordinates of this point at the bottom of the screen.
To access the display window settings, select one of the options under the Graph tab and press OK.
You can choose between three options: Axes, Zoom and Preadjustment.
When you are in the graph display window, you can press the + and - keys to zoom in/out.
In Axes, you can enter the values of Xmin and Xmax that define the width of your display window.
If Yauto is activated, the height of your display window will be automatically calculated to display all points of the curve between Xmin and Xmax. Otherwise, manually enter your Ymin and Ymax values.
Confirm by selecting the Confirm button and pressing OK.
Select Zoom to access an interactive display window setting:
The Preadjustment menu offers you 3 predefined display windows:
The Stats tab displays the statistical variables calculated using the data in the Data tab: