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Posted to dev@jena.apache.org by "A. Soroka (JIRA)" <ji...@apache.org> on 2019/03/28 21:44:00 UTC
[jira] [Commented] (JENA-1693) Add Aggregate Function MEDIAN To
SPARQL ARQ Syntax
[ https://issues.apache.org/jira/browse/JENA-1693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16804329#comment-16804329 ]
A. Soroka commented on JENA-1693:
---------------------------------
[~andy.seaborne], if you can give me a pointer to the right extension point I might try to knock this off.
> 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
> Priority: Minor
> Labels: features
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> 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 agg:median(?age) AS ?median
> WHERE
> { ?x ex:age ?age }
>
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