Data visualisation for the Tiltaksovervakingen

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The plots on this page highlight possible outliers (red dots) in the "new" data for individual time series (the vertical red line marks the boundary between the "historic" and "new" data series). The interquartile range (IQR) for the historic data is first calculated, then outliers in the "new" data are identified if values are either:

• More than 4 * IQR above the upper quartile, or
• Less than 4 * IQR below the lower quartile

Plots are shown for all data series with at least one identified outlier (where a "data series" is defined as a unique combination of station code, parameter and depth information). Note that plots are only shown for data series with at least 50 measurements in the historic period, to ensure the historic IQR can be estimated robustly.

Choose your station code, parameter and depth interval of interest from the drop-down list at the bottom of the screen to begin exploring the data.

• Use the scroll wheel on your mouse to zoom in and out on the plots
• Click-and-drag to pan from side to side
• Double-click to return to the full extent of the data (it is a good idea to do this when you change the parameter)
• Hover the mouse pointer over data points to see additional details ("tooltips")
• After selecting an option in the drop-down list, you may find it easier to use the up and down arrow keys (rather than the mouse) to change series