Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/11108#discussion_r56434528
--- Diff: examples/src/main/python/mllib/hypothesis_testing_example.py ---
@@ -0,0 +1,63 @@
+#
+# 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.
+#
+
+from __future__ import print_function
+
+from pyspark import SparkContext
+# $example on$
+from pyspark.mllib.linalg import Matrices, Vectors
+from pyspark.mllib.regression import LabeledPoint
+from pyspark.mllib.stat import Statistics
+# $example off$
+
+if __name__ == "__main__":
+ sc = SparkContext(appName="HypothesisTestingExample") # SparkContext
+
+ # $example on$
+ vec = Vectors.dense(0.1, 0.15, 0.2, 0.3, 0.25) # a vector composed of
the frequencies of events
+
+ # compute the goodness of fit. If a second vector to test against
+ # is not supplied as a parameter, the test runs against a uniform
distribution.
+ goodnessOfFitTestResult = Statistics.chiSqTest(vec)
+ print(goodnessOfFitTestResult) # summary of the test including the
p-value, degrees of freedom,
+ # test statistic, the method used, and the null hypothesis.
+ print()
--- End diff --
It is weird to have a `print()` line right after a comment. We can do
`print("%s\n" % goodnessOfFitTestResult)`.
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