1 /*

     2 * Portions Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * The original NIST Statistical Test Suite code is placed in public domain.

    16 * (http://csrc.nist.gov/groups/ST/toolkit/rng/documentation_software.html) 

    17 * 

    18 * This software was developed at the National Institute of Standards and Technology by 

    19 * employees of the Federal Government in the course of their official duties. Pursuant

    20 * to title 17 Section 105 of the United States Code this software is not subject to 

    21 * copyright protection and is in the public domain. The NIST Statistical Test Suite is

    22 * an experimental system. NIST assumes no responsibility whatsoever for its use by other 

    23 * parties, and makes no guarantees, expressed or implied, about its quality, reliability, 

    24 * or any other characteristic. We would appreciate acknowledgment if the software is used.

    25 */

    26 

    27 #include "openc.h"

    28 #include "../include/externs.h"

    29 #include "../include/cephes.h"

    30 

    31 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

    32                               R U N S  T E S T 

    33  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

    34 

    35 void

    36 Runs(int n)

    37 {

    38 	int		S, k;

    39 	double	pi, V, erfc_arg, p_value;

    40 

    41 	S = 0;

    42 	for ( k=0; k<n; k++ )

    43 		if ( epsilon[k] )

    44 			S++;

    45 	pi = (double)S / (double)n;

    46 

    47 	if ( fabs(pi - 0.5) > (2.0 / sqrt(n)) ) {

    48 		fprintf(stats[TEST_RUNS], "\t\t\t\tRUNS TEST\n");

    49 		fprintf(stats[TEST_RUNS], "\t\t------------------------------------------\n");

    50 		fprintf(stats[TEST_RUNS], "\t\tPI ESTIMATOR CRITERIA NOT MET! PI = %f\n", pi);

    51 		p_value = 0.0;

    52 	}

    53 	else {

    54 

    55 		V = 1;

    56 		for ( k=1; k<n; k++ )

    57 			if ( epsilon[k] != epsilon[k-1] )

    58 				V++;

    59 	

    60 		erfc_arg = fabs(V - 2.0 * n * pi * (1-pi)) / (2.0 * pi * (1-pi) * sqrt(2*n));

    61 		p_value = erfc(erfc_arg);

    62 		

    63 		fprintf(stats[TEST_RUNS], "\t\t\t\tRUNS TEST\n");

    64 		fprintf(stats[TEST_RUNS], "\t\t------------------------------------------\n");

    65 		fprintf(stats[TEST_RUNS], "\t\tCOMPUTATIONAL INFORMATION:\n");

    66 		fprintf(stats[TEST_RUNS], "\t\t------------------------------------------\n");

    67 		fprintf(stats[TEST_RUNS], "\t\t(a) Pi                        = %f\n", pi);

    68 		fprintf(stats[TEST_RUNS], "\t\t(b) V_n_obs (Total # of runs) = %d\n", (int)V);

    69 		fprintf(stats[TEST_RUNS], "\t\t(c) V_n_obs - 2 n pi (1-pi)\n");

    70 		fprintf(stats[TEST_RUNS], "\t\t    -----------------------   = %f\n", erfc_arg);

    71 		fprintf(stats[TEST_RUNS], "\t\t      2 sqrt(2n) pi (1-pi)\n");

    72 		fprintf(stats[TEST_RUNS], "\t\t------------------------------------------\n");

    73 		if ( isNegative(p_value) || isGreaterThanOne(p_value) )

    74 			fprintf(stats[TEST_RUNS], "WARNING:  P_VALUE IS OUT OF RANGE.\n");

    75 

    76 		fprintf(stats[TEST_RUNS], "%s\t\tp_value = %f\n\n", p_value < ALPHA ? "FAILURE" : "SUCCESS", p_value);

    77 	}

    78 

    79 	fprintf(results[TEST_RUNS], "%f\n", p_value);

    80 }