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https://issues.apache.org/jira/browse/MAHOUT-1856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15833728#comment-15833728
]
ASF GitHub Bot commented on MAHOUT-1856:
----------------------------------------
Github user andrewpalumbo commented on a diff in the pull request:
https://github.com/apache/mahout/pull/246#discussion_r97235841
--- Diff:
math-scala/src/main/scala/org/apache/mahout/math/algorithms/regression/tests/AutocorrelationTests.scala
---
@@ -0,0 +1,54 @@
+/**
+ * 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.
+ */
+
+package org.apache.mahout.math.algorithms.regression.tests
+
+import org.apache.mahout.math.algorithms.regression.Regressor
+import org.apache.mahout.math.drm.DrmLike
+import org.apache.mahout.math.drm.RLikeDrmOps._
+import org.apache.mahout.math.function.Functions.SQUARE
+import org.apache.mahout.math.scalabindings.RLikeOps._
+
+
+object AutocorrelationTests {
+
+ //https://en.wikipedia.org/wiki/Durbin%E2%80%93Watson_statistic
+ /*
+ To test for positive autocorrelation at significance α, the test
statistic d is compared to lower and upper critical values (dL,α and dU,α):
+ If d < dL,α, there is statistical evidence that the error terms are
positively autocorrelated.
+ If d > dU,α, there is no statistical evidence that the error terms
are positively autocorrelated.
+ If dL,α < d < dU,α, the test is inconclusive.
+
+ Rule of Thumb:
+ d < 2 : positive auto-correlation
+ d = 2 : no auto-correlation
+ d > 2 : negative auto-correlation
+ */
+ def DurbinWaton[K](model: Regressor[K]): Regressor[K] = {
--- End diff --
misspelling- "DurbinWatson"
> Create a framework for new Mahout Clustering, Classification, and
> Optimization Algorithms
> ------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1856
> URL: https://issues.apache.org/jira/browse/MAHOUT-1856
> Project: Mahout
> Issue Type: New Feature
> Affects Versions: 0.12.1
> Reporter: Andrew Palumbo
> Assignee: Trevor Grant
> Priority: Critical
> Fix For: 0.13.0
>
>
> To ensure that Mahout does not become "A loose bag of algorithms", Create
> basic traits with funtions common to each class of algorithm.
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