Marco Neumann created JENA-1693:
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Summary: Add Aggregate Function MEDIAN To SPARQL ARQ Syntax
Key: JENA-1693
URL: https://issues.apache.org/jira/browse/JENA-1693
Project: Apache Jena
Issue Type: New Feature
Environment: general
Reporter: Marco Neumann
As briefly mentioned to Andy Seaborne I'd like to see the aggregate function
MEDIAN in the ARQ SPARQL syntax.
"Median is the value that separates lower half from the higher half when the
values are ordered in ascending or descending order. It is the middle value in
a given dataset. Medians are helpful in understanding the distribution of data.
This can be done by comparing mean and median values. By observing the
difference between these values we can understand whether the data is left
skewed or right skewed. The formula for median is: Median = ((n + 1)/2) th
number in the series where the numbers are ordered. Here, n denotes the number
of values for the given variable."
DIVYA SPANDANA MARNEN, SPARQL-R: EXTENDED SPARQL FOR STATISTICAL COMPUTATIONS.
example
SELECT median(?age) AS ?median
WHERE{
?x ex:age ?age
}
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