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Add a trend or moving average line to a chart - Microsoft Support
Learn how to add a trendline in Excel, PowerPoint, and Outlook to display visual data trends. Format a trend or moving average line to a chart.

Project values in a series - Microsoft Support
You can fill in a series of values that fit a simple linear trend or an exponential growth trend by using the fill handle or the Series command. To extend complex and nonlinear data, you can use worksheet functions or the regression analysis tool in the Analysis ToolPak Add-in.

TREND function - Microsoft Support
The TREND function returns values along a linear trend. It fits a straight line (using the method of least squares) to the array's known_y's and known_x's. TREND returns the y-values along that line for the array of new_x's that you specify.

FORECAST and FORECAST.LINEAR functions - Microsoft Support
This article describes the formula syntax and usage of the FORECAST.LINEAR and FORECAST functions in Microsoft Excel. Note: In Excel 2016, the FORECAST function was replaced with FORECAST.LINEAR as part of the new Forecasting functions.

LINEST function - Microsoft Support
This article describes the formula syntax and usage of the LINEST function in Microsoft Excel. The LINEST function calculates the statistics for a line by using the "least squares" method to calculate a straight line that best fits your data, and then returns an array that describes the line.

Trendline options in Office - Microsoft Support
A linear trendline usually shows that something is increasing or decreasing at a steady rate. A linear trendline uses this equation to calculate the least squares fit for a line: where m is the slope and b is the intercept.

Use the Analysis ToolPak to perform complex data analysis
The Regression analysis tool performs linear regression analysis by using the "least squares" method to fit a line through a set of observations. You can analyze how a single dependent variable is affected by the values of one or more independent variables.

Create a chart from start to finish - Microsoft Support
Learn how to create a chart in Excel and add a trendline. Visualize your data with a column, bar, pie, line, or scatter chart (or graph) in Office.

Project values in a series - Microsoft Support
You can use Excel to project values that are based on existing data or to automatically generate values based on linear or growth trend calculations. Fill in a series that fits a simple trend, use functions to extend complex and nonlinear data, or perform regression analysis with the Analysis ToolPak Add-in.

Define and solve a problem by using Solver - Microsoft Support
Solver is a Microsoft Excel add-in program you can use for what-if analysis. Use Solver to find an optimal (maximum or minimum) value for a formula in one cell — called the objective cell — subject to constraints, or limits, on the values of other formula cells on a worksheet.