However, when I tried to use the original x data to calculate y using the trendline equation, it doesn't appear right. ![]() ![]() So, don't expect a proper intersection with Y-axis.įor example, for a line chart, the vertical (Value) axis crosses the horizontal (Category) axis at a non-zero position - see the example above. Excel trendline looks fine but the equation is completely wrong I used excel to fit a curve to some data points (x,y). In D2 enter: SLOPE (B2:B20,A2:A20) and in E2 enter: INTERCEPT (B2:B20,A2:A20) There are equally simple formulas to get the parameters of other non-linear fits such as higher order polynomials, etc. Excel treats the Category axis values for all other chart types as the list to calculate the trend and its formula, where n is the number of text elements on the axis.Īttention! Excel takes the first value as x = 1, not x = 0 as usual. 2 Say we have data in columns A and B like: To do a linear trend we need a slope and intercept. Excel generates a mathematically correct trend line using data values only for the XY scatter plot because the Y-axis and the X-axis are real numeric values for this type of chart.When creating a trend line, you should remember that Excel treats any data along the axes as numbers:.You cannot add a trendline for 3-D or stacked charts, pie, radar, and similar. In Excel, trendlines can be added for 2-dimensional charts only: a 2-D area, bar, line, column, stock, scatter, or bubble chart. ![]() Excel makes adding a trend line to a chart quite simple.
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