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Searching data / Building a query / Operations reference / Aggregation operations / Median / 2nd quartile / Percentile 50 (median)

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Median / 2nd quartile / Percentile 50 (median)

Description

Returns the median of the values found in a specified column for each grouping occurrence.

How does it work in the search window?

Before being able to perform this operation, you have to group your data. Be aware that the columns used as arguments for the grouping operation will not be available to select as arguments for the aggregation operation.

After grouping the data, select Aggregation in the search window toolbar, then select the Median / 2nd quartile / Percentile 50 operation. You need to specify one argument:

ArgumentData type
Source (mandatory)
integer

The data type of the aggregated values is integer.

Example

In the demo.ecommerce.data table, we want to get the median of the bytesTransferred column values in each 5-minute period. Before aggregating the data, the table must be grouped in 5-minute intervals. Then we will perform the aggregation using the Median / 2nd quartile / Percentile 50 operation.

The arguments needed for the Median / 2nd quartile / Percentile 50 operation are:

  • Source → bytesTransferred column

Click Aggregate function and you will see the following result:

How does it work in LINQ?

Group your data using the following structure:

  • group every server period by column1, column2...
    every client period

Then, use select... as...  to add the new column that will show the aggregated values. This is the syntax for the Median / 2nd quartile / Percentile 50 operation:

  • median(integer_column)

See Build a query using LINQ to learn more about grouping and aggregating your data using the LINQ language.

Example

You can copy the following LINQ script and try the example above on the demo.ecommerce.data table:

from demo.ecommerce.data
  group every 5m
  every 5m
  select median(bytesTransferred) as bytesTransferred_median
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