| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| declare function median($x) |
| { |
| let $c := count($x) |
| return avg( |
| for $i at $p in (for $j in $x order by $j return $j) |
| where $p >= floor(($c-1)/2.0) and $p <= $c/2 |
| return $i |
| ) |
| } |
| |
| |
| declare function MAD($x) |
| { |
| let $m := median($x) |
| return median(for $j in $x order by abs($j-$m) return abs($j-$m)) |
| } |
| |
| MAD([2, 3, 4, 1, 5, 6, 10, 0]) |
| |