src/ports/postgres/modules/stats/test/chi2_test.ic.sql_in

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/* -----------------------------------------------------------------------------
 * Test Chi-squared goodness-of-fit test.
 *
 * Example taken from:
 * http://www.statsdirect.com/help/chi_square_tests/chi_good.htm
 * -------------------------------------------------------------------------- */

CREATE TABLE chi2_test_blood_group (
    id SERIAL,
    blood_group VARCHAR,
    observed BIGINT,
    expected DOUBLE PRECISION
);

INSERT INTO chi2_test_blood_group(blood_group, observed, expected) VALUES
    ('O', 67, 82.28),
    ('A', 83, 84.15),
    ('B', 29, 14.96),
    ('AB', 8, 5.61);

SELECT chi2_gof_test(observed, expected) FROM chi2_test_blood_group;