Ok, now it’s time for the moment of truth. Then, we can calculate k, which is equal to the slope times m. Next, we can calculate the intercept, 1/m:įinally, we can calculate the values of k and m.įirst we’ll calculate m, which equals 1 divided by the intercept: Since we’re concerned about the linear form of the equation, known_y’s is the calculated column containing the 1/y values, and known_x’s is the 1/x values. Calculating the Slope and Interceptįirst, we’ll calculate the slope, k/m, of the data with the slope function: We could use the LINEST function to get both at once, or we could use the SLOPE and INTERCEPT functions to obtain the values separately.įor this exercise, SLOPE and INTERCEPT are more straightforward, so let’s use them. There are a couple of different ways we could go about getting the best-fit slope and intercept from this data.
So, the term k/m is now the slope of this equation and 1/m is the intercept. Remember, we’ve linearized the hyperbolic equation into the form: (How about that? It’s almost like I planned it that way. Just as a quick check, we can plot these two new columns (E and F) on a chart and see that the relationship between them is indeed linear. When the formulas are filled down, we get the following: It can be worked around in the following manner:ġ. Create a new chart in Excel and add a trendline.Ģ. Add the Equation or the R-Square: Select the trendline then right-click the trendline or choose Format>Selected Trendline from the menu.ģ. Now simply open the workbook with ExcelApplication.Open, retrieve the trendline and program it any way you like (Including changing the trendline regression type or value or show/hide the Equation or R-Squared value): Trendline trend = oSeries.Trendlines //now this will work trend.We need to create two new columns in our spreadsheet – one for values of 1/x and another for the values of 1/y. This issue persists for the BIFF (XLS) file format. This issue has been resolved for charts in the OOXML file format (XLSX, XLSM) as part of implementing OOXML support for ExcelApplication in OfficeWriter v8.0.
From that point on you can programmatically change the label as you like using the properties. However, if you open, with ExcelApplication, an existing workbook which already has a Trendline label these properties will work properly. Setting these properties to true does not seem to have any effect and the label is not shown.
The Trendline object has the properties to ShowEquation and ShowRSquaredValue. Trendlines can also be created as objects in ExcelApplication through the Series of a Chart. It is possible, in Excel, to add a label to a trendline of a chart that shows the Equation or the R-squared value of the trendline like in the image below:
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