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Marco Neumann commented on JENA-1693: ------------------------------------- created a new fork on github made the changes and made the PR. I did not push changes to Grammar/sparql_11.jj since this only applies to ARQ syntax. Same with jena/jena-arq/Grammar/tokens.txt. is that file for documentation only? And did not push public static final String tagMedian = "median" in jena/jena-arq/src/main/java/org/apache/jena/sparql/sse/Tags.java. jena doc still needs to be created. the new new keyword median not yet recognized in webapp query interface as keyword. still needs a test > 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 } > -- This message was sent by Atlassian JIRA (v7.6.3#76005)