src/ports/postgres/modules/stats/test/mw_test.ic.sql_in

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 *
 * 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,
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
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 *//* ----------------------------------------------------------------------- */

/* -----------------------------------------------------------------------------
 * Test Mann-Whitney-test.
 *
 * Example taken from:
 * http://www.itl.nist.gov/div898/handbook/prc/section3/prc35.htm
 * -------------------------------------------------------------------------- */

CREATE TABLE nist_mw_example (
	id SERIAL,
	group_a FLOAT8,
	rank_a FLOAT8,
	group_b FLOAT8,
	rank_b FLOAT8
);

COPY nist_mw_example(group_a, rank_a, group_b, rank_b) FROM stdin;
.55	8	.49	5
.67	15.5	.68	17
.53	7	.77	22
.44	2	.62	12
.65	13.5	.48	3.5
.75	20.5	.59	9.5
\.

CREATE TABLE mw_test AS
SELECT (mw_test(from_first, value ORDER BY value)).*
FROM (
    SELECT TRUE AS from_first, group_a AS value
    FROM nist_mw_example
    UNION ALL
    SELECT FALSE, group_b
    FROM nist_mw_example
) q;