![]() The terms Table, Pane and Cell define the scope for the item:įor a more complicated view-for example, if the view contains a line chart with multiple or dual axes-Tableau shows you an expanded drop target area: In Tableau Desktop, the process is the same but the user interface looks a bit different. The view above is from a web editing session. In a simple case, the drop target area offers three options: The range of choices varies depending on the type of item and the current view. You can add a reference line to any continuous axis in the view.ĭrag Reference Line from the Analytics pane into the view. Tableau provides different box plot styles, and allows you to configure the location of the whiskers and other details. Box plots show quartiles (also known as hinges) and whiskers. See Add a Bullet Graph later in this article for specifics.īox Plots - Box plots (also known as box and whisker charts) are a standardized graphic for describing the distribution of values along an axis. Reference distributions can also be used to create bullet charts. Distribution can be definedīy percentages, percentiles, quantiles (as in the following image), or The distribution of values along the axis. Reference Distributions - Reference distributions add a gradient of shading to indicate Reference Bands - Reference bands shade an area behind the marks in the viewīetween two constant or computed values on the axis. You can also include confidence intervals with a reference line. Computed values can be based on a specified field. Reference Lines - You can add a reference line at a constant or computed value You can add reference lines, bands, distributions, or (in Tableau Desktop but not on the web) box plots to any continuous axis in the view. Types of Reference Lines, Bands, Distributions, and Boxes Tableau lets you add as many reference lines, bands, distributions, and box plots to a view as you require. Line at the average sales mark so you can see how each product performed against Sales for several products, you can include a reference For example, if you are analyzing the monthly Region, or range on a continuous axis in a Tableau view. Again, you can verify this number by using the QUARTILE.EXC function or looking at the box and whisker plot.You can add a reference line, band, distribution, or box plot to identify a specific value, This makes sense, the median is the average of the middle two numbers.Ħ. You can verify this number by using the QUARTILE.EXC function or looking at the box and whisker plot.ĥ. In this example, n = 8 (number of data points).Ĥ. This function interpolates between two values to calculate a quartile. For example, select the even number of data points below.Įxplanation: Excel uses the QUARTILE.EXC function to calculate the 1st quartile (Q 1), 2nd quartile (Q 2 or median) and 3rd quartile (Q 3). Most of the time, you can cannot easily determine the 1st quartile and 3rd quartile without performing calculations.ġ. ![]() As a result, the whiskers extend to the minimum value (2) and maximum value (34). As a result, the top whisker extends to the largest value (18) within this range.Įxplanation: all data points are between -17.5 and 34.5. Therefore, in this example, 35 is considered an outlier. A data point is considered an outlier if it exceeds a distance of 1.5 times the IQR below the 1st quartile (Q 1 - 1.5 * IQR = 2 - 1.5 * 13 = -17.5) or 1.5 times the IQR above the 3rd quartile (Q 3 + 1.5 * IQR = 15 + 1.5 * 13 = 34.5). In this example, IQR = Q 3 - Q 1 = 15 - 2 = 13. ![]() ![]() On the Insert tab, in the Charts group, click the Statistic Chart symbol.Įxplanation: the interquartile range (IQR) is defined as the distance between the 1st quartile and the 3rd quartile. ![]()
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