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Diffstat (limited to 'examples/src/main/python/mllib/hypothesis_testing_kolmogorov_smirnov_test_example.py')
| -rw-r--r-- | examples/src/main/python/mllib/hypothesis_testing_kolmogorov_smirnov_test_example.py | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/examples/src/main/python/mllib/hypothesis_testing_kolmogorov_smirnov_test_example.py b/examples/src/main/python/mllib/hypothesis_testing_kolmogorov_smirnov_test_example.py new file mode 100644 index 0000000000..ef380dee79 --- /dev/null +++ b/examples/src/main/python/mllib/hypothesis_testing_kolmogorov_smirnov_test_example.py @@ -0,0 +1,40 @@ +# +# 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.stat import Statistics +# $example off$ + +if __name__ == "__main__": + sc = SparkContext(appName="HypothesisTestingKolmogorovSmirnovTestExample") + + # $example on$ + parallelData = sc.parallelize([0.1, 0.15, 0.2, 0.3, 0.25]) + + # run a KS test for the sample versus a standard normal distribution + testResult = Statistics.kolmogorovSmirnovTest(parallelData, "norm", 0, 1) + # summary of the test including the p-value, test statistic, and null hypothesis + # if our p-value indicates significance, we can reject the null hypothesis + # Note that the Scala functionality of calling Statistics.kolmogorovSmirnovTest with + # a lambda to calculate the CDF is not made available in the Python API + print(testResult) + # $example off$ + + sc.stop() |