You can find all the formulas in the second part of this tutorial (Excel trendline equations and formulas). A value close to 1 indicates a good fit, while a value close to 0 indicates a poor fit. That said a number of the options do give you the option to set the intercept which can help or change particular characteristics like power of the polynomial. In the following example, an exponential trendline is used to illustrate the decreasing amount of carbon 14 in an object as it ages. This adds the default Linear trendline to the chart. In case you still need an answer, y = 3E + 08x^(-1.611) means y = (3*10^8) * x^(-1.611). Use these six steps to extend your trendline: Open your data set and right-click your trendline. This wikiHow teaches you how to shorten the appearance of data in Microsoft Excel. Check Linear trendline is chosen and close the Format Trendline Window. Then, go to the Sparkline tab of the ribbon, which you will only see after choosing the trendline. In Excel, there are six ways to generate a trendline. It seems from your response that there isn't. If you have a completely different form then I would set it up as an equation that uses the parameters set in fixed cells and then add another column to calculate the R^2 value for each point and then the sum so you can use the solver (Data -> what-if analysis -> Goal Seek) to find at least 1 parameter based on minimizing that R^2. This will open a box like this in the picture. PC Review is a computing review website with helpful tech support forums staffed by PC experts. The formatting options for the desired category then appear in collapsible and expandable lists at the bottom of the task pane. Using Mac. In your real worksheets, you should choose the trendline type corresponding to your data type. Click at the Chart Element icon and test the Trendline checkbox. Sharing best practices for building any app with .NET. Thank you , this is clear, please share with us how to get the second part. The incorrect y values are all in the range of -2.38E+15, plus and minus. is there another TREND_FOR_POLYNOMINAL_OF_SECOND_ORDER function? You can also give your trendline a name and choose forecasting options. https://support.office.com/en-us/article/linest-function-84d7d0d9-6e50-4101-977a-fa7abf772b6d. A power trendline in Excel is drawn based on this simple equation: Where a and b are constants, which can be calculated with these formulas: a: =EXP(INDEX(LINEST(LN(y), LN(x),,), 1, 2)). Not sure about exponential, but for the power trendline you can use =RSQ(LOG10(Known_y's),LOG10(Known_x's)) to calculate R^2. Truncating Text Using the LEFT and RIGHT Formulas, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/22\/Truncate-Text-in-Excel-Step-1-Version-6.jpg\/v4-460px-Truncate-Text-in-Excel-Step-1-Version-6.jpg","bigUrl":"\/images\/thumb\/2\/22\/Truncate-Text-in-Excel-Step-1-Version-6.jpg\/aid712981-v4-728px-Truncate-Text-in-Excel-Step-1-Version-6.jpg","smallWidth":460,"smallHeight":344,"bigWidth":728,"bigHeight":544,"licensing":"