Intercept Function: Provides the y-intercept for the equation and has the same structure as slope. In the example above I have opted to select the entire column in both cases because that means that the formula does not need to be adjusted even if additional data is added. Slope Function: Provides the slope or gradient of the line of best fit and its structure is Slope(Y values, X Values). Still need help? Go to Microsoft Community.Calculating Values for X and Y by Graphing | TI-83 Plus and TI-84 Plus Graphing Calculators Explanation Of The Formula In the Decimal places box, increase the number of decimal places to 30 so that you can see all the decimal places.Select the Number tab, and then select Number in the Category list.On the Format menu, click Selected Data Labels.In the chart, select the trendline equation.To work around this behavior, increase the digits in the trendline equation by increasing the number of decimal places that are displayed. This can cause a trend to appear to be incorrect. However, the accuracy of the chart is significantly reduced. This behavior allows the equation to occupy less space in the chart area. For appearance, each X value is rounded off to the number of significant digits that are displayed in the chart. Microsoft Excel plots trendlines incorrectly because the displayed equation may provide inaccurate results when you manually enter X values.
Therefore, the trendline will be inaccurate if it is displayed on these types of charts. In these chart types, the X axis is plotted as only a linear series, regardless of what the labels actually are. Line, Column, and Bar charts plot only the Y axis as values. This chart plots both the X axis and Y axis as values. The trendline formula is used for an XY Scatter chart.
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