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<?php
/**
* @package PDL
*
* Script to test NegativeBinomialDistribution methods
*/
require_once '../NegativeBinomialDistribution.php';
require_once 'make_table.php';
$n = 5;
$p = .2;
$nbin = new NegativeBinomialDistribution($n, $p);
$Output[0] = $nbin->getMean();
$Output[1] = $nbin->getVariance();
$Output[2] = $nbin->PDF(15);
$Output[3] = $nbin->CDF(7);
$Output[4] = $nbin->ICDF(.072);
$Output[5] = $nbin->RNG(1);
$Methods = array("getMean()","getVariance()","PDF(15)","CDF(7)","ICDF(.072)","RNG(1)");
make_table("NegativeBinomialDistribution($n, $p)", "Methods", "Output", $Methods, $Output);
// Test PDF function by feeding an array of $x_vals and
// getting a corresponding array of $p_vals.
$X_Vals = array(1, 2, 3, 4, 5, 6);
$P_Vals = $nbin->PDF($X_Vals);
make_table("PDF(X_VALS)", "X Vals Input", "P Vals Output", $X_Vals, $P_Vals);
// Test CDF function by feeding an array of $x_vals and getting
// a corresponding array of $p_vals where each p_val corresponds
// to p(X < $X_Vals[$i])
$X_Vals = array(1, 2, 3, 4, 5, 6, 7);
$P_Vals = $nbin->CDF($X_Vals);
make_table("CDF(X_VALS)", "X Vals Input", "P Vals Output", $X_Vals, $P_Vals);
// Test ICDF function by feeding in P_Vals from previous
// test. Result should be mirror of CDF output.
$X_Vals = $nbin->ICDF($P_Vals);
make_table("ICDF(P_VALS)", "P Vals Input", "X Vals Output", $P_Vals, $X_Vals);
// Test RNG function by passing the number of values you want generated.
// Result is an array of random numbers from an exponential distribution
$Counter = range(0, 7);
$Rnd_Vals = $nbin->RNG(8);
make_table("RNG(N_VALS)", "Counter", "Rnd Vals", $Counter, $Rnd_Vals);
?>