Degree of polynomial must be given (at least 2). Polynomial trend line: regression through equation y=Σ i (a i ∙x i ). Linear trend line: regression through equation y=a∙x+b. The following regression types are available: R 2 values can not be compared with forced or free intercept. If intercept is forced, coefficient of determination R 2 is not calculated in the same way as with free intercept.
To show the coefficient of determination R 2, select the equation in the chart, right-click to open the context menu, and choose Insert R 2. To change these names, select the trend line, choose Format - Format Selection – Type and enter names in X Variable Name and Y Variable Name edit boxes. To change format of values (use less significant digits or scientific notation), select the equation in the chart, right-click to open the context menu, and choose Format Trend Line Equation - Numbers.ĭefault equation uses x for abscissa variable, and f(x) for ordinate variable. To show the trend line equation, select the trend line in the chart, right-click to open the context menu, and choose Insert Trend Line Equation. When the chart is in edit mode, LibreOffice gives you the equation of the trend line and the coefficient of determination R 2, even if they are not shown: click on the trend line to see the information in the status bar. Trend Line Equation and Coefficient of Determination Its name can be defined in options of the trend line. A trend line is shown in the legend automatically.
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