test_bayes.php

PHP NaiveBayes源代码

<?php

// test_bayes.php

include "Bayes.php";

// Different possible disease the patient might have
$disease_labels = array("d1", "d2", "d3");

// Where patient is assessed as to whether they exhibit symptom 1 and/or symptom 2
$symptom_labels = array("++", "+-", "-+", "--");  

// Load the disease base rates
// $priors = array(.3215, .2125, .4660);
$priors = array(.322, .214, .464);

// Load liklihood estimates
$likelihood[0] = array(.656, .094, .219, .031);
$likelihood[1] = array(.186, .062, .559, .193);
$likelihood[2] = array(.109, .766, .016, .109);

// Instantiate Bayes object using specified priors and likelihood
$bayes = new Bayes($priors, $likelihood);

// Call the big hammer
$bayes->getPosterior();

echo "<p>";
echo "The probability of each disease type given the presence or absence of symptoms is: ";
echo "</p>";

$bayes->setRowLabels($symptom_labels);    // i.e., evidence
$bayes->setColumnLabels($disease_labels); // i.e., hypothesis
$bayes->toHTML();

echo "<br />";
echo "<p>";
echo "Here is what a dump of the Bayes object looks: ";
echo "</p>";

echo "<pre>";
print_r($bayes);
echo "</pre>";

?>