<?php
function pid($x)
{
var_dump($x);
return $x;
}
function f($x)
{
return $x;
}
function ttest()
{
return f(pid('arg1'), pid('arg2'));
}
ttest();
function printTtest()
{
$before = array(25, 25, 27, 44, 30, 67, 53, 53, 52, 60, 28);
printf("before:");
foreach ($before as $elm) {
printf(" %d", $elm);
}
printf("\n");
$after = array(27, 29, 37, 56, 46, 82, 57, 80, 61, 59, 43);
printf("after:");
foreach ($after as $elm) {
printf(" %d", $elm);
}
printf("\n");
$dArr = sampDiff($before, $after);
printf("differences:");
foreach ($dArr as $elm) {
printf(" %d", $elm);
}
printf("\n");
$dMean = sampMean($dArr);
$dVar = sampVar($dArr);
printf("mean: %.5f, var: %.5f\n", sampMean($dArr), sampVar($dArr));
$p = ttest($before, $after, true, 2, true, 0.95, $lower, $upper);
printf("ttest(before, after, welch=true, sides=2, paired=true)" . " --> %.5f (%.5f .. %.5f)\n", $p, $lower, $upper);
$p = ttest($before, $after, false, 2, true, 0.95, $lower, $upper);
printf("ttest(before, after, welch=false, sides=2, paired=true)" . " --> %.5f (%.5f .. %.5f)\n", $p, $lower, $upper);
}