1 /*************************************************************************/
2 /*                                                                       */
3 /*                  Language Technologies Institute                      */
4 /*                     Carnegie Mellon University                        */
5 /*                        Copyright (c) 2001                             */
6 /*                        All Rights Reserved.                           */
7 /*                                                                       */
8 /*  Permission is hereby granted, free of charge, to use and distribute  */
9 /*  this software and its documentation without restriction, including   */
10 /*  without limitation the rights to use, copy, modify, merge, publish,  */
11 /*  distribute, sublicense, and/or sell copies of this work, and to      */
12 /*  permit persons to whom this work is furnished to do so, subject to   */
13 /*  the following conditions:                                            */
14 /*   1. The code must retain the above copyright notice, this list of    */
15 /*      conditions and the following disclaimer.                         */
16 /*   2. Any modifications must be clearly marked as such.                */
17 /*   3. Original authors' names are not deleted.                         */
18 /*   4. The authors' names are not used to endorse or promote products   */
19 /*      derived from this software without specific prior written        */
20 /*      permission.                                                      */
21 /*                                                                       */
22 /*  CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK         */
23 /*  DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING      */
24 /*  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT   */
25 /*  SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE      */
26 /*  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES    */
27 /*  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN   */
28 /*  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,          */
29 /*  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF       */
30 /*  THIS SOFTWARE.                                                       */
31 /*                                                                       */
32 /*************************************************************************/
33 /*             Author:  Alan W Black (awb@cs.cmu.edu)                    */
34 /*               Date:  November 2001                                    */
35 /*************************************************************************/
36 /*                                                                       */
37 /*  sufficient statitsics                                                */
38 /*                                                                       */
39 /*************************************************************************/
40 #ifndef _CST_SS_H__
41 #define _CST_SS_H__
42 
43 typedef struct cst_ss_struct {
44     double num_samples;
45     double sum;
46     double sumx;
47 } cst_ss;
48 
49 cst_ss *new_ss();
50 void delete_ss(cst_ss *ss);
51 void ss_reset(cst_ss *ss);
52 double ss_mean(cst_ss *ss);
53 double ss_variance(cst_ss *ss);
54 double ss_stddev(cst_ss *ss);
55 void ss_cummulate(cst_ss *ss,double a);
56 void ss_cummulate_n(cst_ss *ss,double a, double count);
57 
58 #endif
59