/* ----------------------------------------------------------------------- *//**
 *
 * 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.
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 *//* ----------------------------------------------------------------------- */

/* -----------------------------------------------------------------------------
 * Cox proportional hazard survival regression
 *
 * Both Example taken from:
 * http://www.sph.emory.edu/~cdckms/CoxPH/prophaz2.html
 * -------------------------------------------------------------------------- */

DROP TABLE IF EXISTS leukemia;
CREATE TABLE leukemia (
    id INTEGER NOT NULL,
    grp DOUBLE PRECISION,
    wbc DOUBLE PRECISION,
    timedeath INTEGER,
    status BOOLEAN
);


INSERT INTO leukemia(id, grp, wbc, timedeath,status) VALUES
(0,0,1.45,35,TRUE),
(1,0,1.47,34,TRUE),
(3,0,2.2,32,TRUE),
(22,1,4.01,3,TRUE),
(23,1,4.91,2,TRUE),
(24,1,5,1,TRUE),
(25,NULL,4.01,3,TRUE);

drop table if exists coxph_out;
drop table if exists coxph_out_summary;
select coxph_train('leukemia', 'coxph_out', 'timedeath', 'ARRAY[grp, wbc]', 'status', NULL, NULL);