Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1733#discussion_r15981590
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/stat/HypothesisTestSuite.scala ---
@@ -0,0 +1,128 @@
+/*
+ * 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.spark.mllib.stat
+
+import org.scalatest.FunSuite
+
+import org.apache.spark.mllib.linalg.{DenseVector, Matrices, Vectors}
+import org.apache.spark.mllib.regression.LabeledPoint
+import org.apache.spark.mllib.stat.test.ChiSquaredTest
+import org.apache.spark.mllib.util.LocalSparkContext
+import org.apache.spark.mllib.util.TestingUtils._
+
+class HypothesisTestSuite extends FunSuite with LocalSparkContext {
+
+ test("chi squared pearson goodness of fit") {
+
+ val observed = new DenseVector(Array[Double](4, 6, 5))
+ val pearson = Statistics.chiSqTest(observed)
+
+ // Results validated against the R command `chisq.test(c(4, 6, 5),
p=c(1/3, 1/3, 1/3))`
+ assert(pearson.statistic === 0.4)
+ assert(pearson.degreesOfFreedom === 2)
+ assert(pearson.pValue ~= 0.8187 relTol 1e-4)
--- End diff --
`~=` -> `~==`. The latter tells more when something is wrong. (and please
also update other places)
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