Note If Analysis ToolPak is not listed in the Add-Ins available box, click Browse to locate it.
In the Add-Ins available box, click to select the Analysis ToolPak check box, and then click OK. To do this in Excel 2007, follow these steps:Ĭlick the Microsoft Office Button, and then click Excel Options.Ĭlick Add-Ins, and then select Excel Add-ins in the Manage box. Before you use the Regression tool in Excel, you have to load the Analysis ToolPak. It is available when you install Microsoft Office or Excel. The Analysis ToolPak is an Excel add-in program. The Regression tool is included in the Analysis ToolPak. The number of rows of data must be larger than the number of columns of data (x-columns plus y-columns).ĭo not specify a zero constant (b=0) in the function.
It is not statistically valid for the number of rows to be less than the number of x (variable) columns. Case 2: The number of rows is less than the number of x-columns In Microsoft Office Excel 2003 and in earlier versions of Excel, you can find the Regression tool by clicking Data Analysis on the Tools menu. In Microsoft Office Excel 2007, you can find the Regression tool by clicking Data Analysis in the Analysis group on the Data tab. You can use the Regression tool instead of the LINEST worksheet function. Note The Regression tool alerts you to this problem and does not continue. Do not overlap the x- and y-value ranges when referencing cells in the formula. Normal statistical probability disallows the values in the x and y ranges to overlap (duplicate each other). If the x-value and y-value ranges overlap, the LINEST worksheet function produces incorrect values in all result cells. Workaround Case 1: The x-value and y-value ranges overlap You specify a zero constant (set the third argument of the LINEST function to True). The number of rows in the input range is less than the number of columns in the total range (x-value plus y-value). The range of x-values overlaps the range of y-values. The output returned from LINEST may be incorrect if one or more of the following conditions are true:
The Regression tool in the Analysis ToolPak may also return incorrect values. When you use the LINEST worksheet function in a worksheet in Microsoft Excel, the statistical output may return incorrect values. Incorrect output is returned when you use the Linear Regression (LINEST) function in Excel Symptoms
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