include/cst_ss.h

/*************************************************************************/
/*                                                                       */
/*                  Language Technologies Institute                      */
/*                     Carnegie Mellon University                        */
/*                        Copyright (c) 2001                             */
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/*                                                                       */
/*************************************************************************/
/*             Author:  Alan W Black (awb@cs.cmu.edu)                    */
/*               Date:  November 2001                                    */
/*************************************************************************/
/*                                                                       */
/*  sufficient statitsics                                                */
/*                                                                       */
/*************************************************************************/
#ifndef _CST_SS_H__
#define _CST_SS_H__

typedef struct cst_ss_struct {
    double num_samples;
    double sum;
    double sumx;
} cst_ss;

cst_ss *new_ss();
void delete_ss(cst_ss *ss);
void ss_reset(cst_ss *ss);
double ss_mean(cst_ss *ss);
double ss_variance(cst_ss *ss);
double ss_stddev(cst_ss *ss);
void ss_cummulate(cst_ss *ss,double a);
void ss_cummulate_n(cst_ss *ss,double a, double count);

#endif