Trend line - Wikipedia

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I will try to explain the differences and when to use them.

Updated Nov 16, What Is a Trendline?

On Tableau, you can download the Superstore sample dataset and put sales on Columns and Profit on the Y-axis to follow along. If we choose the circle under the marks card we get a scatter plot. Here this would try to see the relationship between sales and profit.

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The linear graph can sometimes be unrealistic, for example, the y-intercept is negative. Linear trend line.

The name derives from its shape, an exponential or rapid increase. A logarithmic equation is similar to the inverse of the exponential function.

Excel trendline equation is wrong - reasons and fixes Excel trendline types When adding a trendline in Excel, you have 6 different options to choose from. Additionally, Microsoft Excel allows displaying a trendline equation and R-squared value in a chart: Trendline equation is a formula that finds a line that best fits the data points.

Here Ln represents the natural logarithm or log base e. The graph tends to rise very quickly and then trails off slowly rising as the x value increases.

trend line function

The power trend line does not have a constant and is dependant on the x-axis value and a constant determined by tableau. It may look similar to the linear function in the graph, but it is created from a completely different function. The R squared value is always between 0 and 1 and represents the explained variation divided by the total variation.

trend line function

Going through the iterations of the different trend lines using the superstore data between profit and sales I found the power trend line to have the highest R squared value. Of course, I would not recommend using the trend line that has the highest R-value all the time, as visualisation is the most important thing to consider.

If it looks nice and matches up with a lot of the points and is easy to comprehend then use it.

trend line function

Also, use some intuition. If the graph looks like it slopes upwards in a curve fashion then a linear trend line is not the best to use.

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However, a linear trend line does have the advantage to be able to clearly see whether the trend is upwards or downwards sloping, and what the magnitude is easier than other lines. P-Value There is P or probability value assigned to the trend line. The lower this value the better.

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Without going into stats too much, Tableau is computing how well your trend line fits the model based on an F statistic with a hypothesis that an intercept only model is accurate. If P is low we reject this and fail to reject or accept, but we trend line function never truly accept a hypothesis the alternate option that this trend trend line function accurately describes the data.

A low p value may be a bad thing as the line may not be the best trend line function to follow.

The type of data you have determines the type of trendline you should use. Trendline reliability A trendline is most reliable when its R-squared value is at or near 1.

To put it another way, there is a 1-p chance that the coefficient of the trend line is not 0.