Hi there, i have a simple x y scatter graph, to which i have a trend line running through it, fine. I have sales from Jan to June and am using trend line to forecast sales for July to Dec. I would really like to see the forecasted numbers on the trend line and not just the trend line itself. For one thing, they start at some maximum value for f(1) and decay to zero as x goes to infinity. The FORECAST function will return the Y value corresponding to a given X value, given your original observations. One of the options in the Trendline Options group is Moving Average, which is useful for smoothing out data that has a lot of variation (that is, "noisy" data).The Moving Average option enables you to specify the number of data points to include in each average. I have a column with each day of the year, a column with the balance for an account for each day (up to today) and a third column that contains the desired balance for each day of the year (through the end of the year). Microsoft Excel plots the incorrect trendline when you manually substitute values for the “x” variable. In the Format Trendline dialog box, in the Trendline Options category, under Trendline Name, click Custom, and then type a … For example, if you select 5, Excel averages every five data points. To base a trendline on numeric x values, you should use an xy (scatter) chart. I have some data points that I am quite certain decay similar to an exponential function. In cell C25, enter the value from B25. Using Exponential Smoothing for forecasting. Before Excel 2016, many used the FORECAST() sheet function, which performs a linear forecast or extended trendlines in chart properties to extrapolate forward.. How to delete a trendline in Excel. I followed the MS help instructions and selected the data series I want to use for the trendline, but when I try to click the Trendlines icon in the task bar, it is grayed out. Trendline Function Always Grayed Out - Excel: View Answers: I have a 2D chart that I want to add a linear trend line to. Excel automatically assigns a name to the trendline, but you can change it. I will show three different ways you can calculate your trendline. Hi Everyone I have a chart with trend line. my X axis goes up to 60 and my Y axis goes to 10, so if i draw accross at 55 from the trend line, i then go down to a number on my Y axis. But when I select that data and ask for a trendline, the exponential option is greyed out. The chart is based on two columns: month and sales. e.g. That's how to do a trendline in Excel. The first option you have is to use the FORECAST function. So far so good. "Add Trendline" grayed out I have an excel chart. The new functionality in Excel 2016 utilizes another algorithm, called Exponential Smoothing or ETS. Trendline equation is a formula that finds a line that best fits the data points. Start with your Month and Revenue data if the first two columns, and delete the rest. The calculation of the linear forecast is quite easy because Excel helps us with different functions. There are many ways to generate a forecast for your historical data. To remove a trendline from your chart, right-click the line, and then click Delete: Or click the Chart Elements button and unselect the Trendline box: Either way, Excel will immediately remove the trendline from a chart. R-squared value measures the trendline reliability - the nearer R2 is to 1, the better the trendline fits the data. In the Forecast section, click on the up arrow in the Forecast box until the entry in the box changes to 6. In Excel 2016, Microsoft introduced FORECAST.ETS which takes some of the hard work out of thie activity. what i need to do is fine some values according to that trend line. Have is to use the Forecast function greyed out fine some values according to that line... 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