On the Number tab, click Number in the Category list, and then change the Decimal places setting to 30 or less.Double-click the trendline equation or R-squared text.Method 2: Microsoft Office Excel 2003 and earlier versions of Excel In the Category list, click Number, and then change the Decimal places setting to 30 or less.Right-click the trendline equation or the R-squared text, and then click Format Trendline Label.Open the worksheet that contains the chart.To display a greater number of digits, use one of the following methods: Method 1: Microsoft Office Excel 2007 equation: Y -0.9X + 7.5, R 2 1 which is way off (and it's not a rounding. Then I added a linear trendline to the chart. The resulting equation is Y -0.136X + 16.448 which seems good. The trendline equation and R-squared value are initially displayed as rounded to five digits. The SLOPE and the INTERCEPT functions returned -0.136 and 16.4448. This article explains how to display more digits in the coefficients. For some purposes, this may not be a sufficient number of significant figures. When you add a trendline to a chart, and then display the equation and R-squared value for the trendline, the equation shows only the first five digits of each coefficient.
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