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cdf_32.c
Go to the documentation of this file.00001 #include "cdflib.h" 00002 void cumnbn(double *s,double *xn,double *pr,double *ompr, 00003 double *cum,double *ccum) 00004 /* 00005 ********************************************************************** 00006 00007 void cumnbn(double *s,double *xn,double *pr,double *ompr, 00008 double *cum,double *ccum) 00009 00010 CUmulative Negative BINomial distribution 00011 00012 00013 Function 00014 00015 00016 Returns the probability that it there will be S or fewer failures 00017 before there are XN successes, with each binomial trial having 00018 a probability of success PR. 00019 00020 Prob(# failures = S | XN successes, PR) = 00021 ( XN + S - 1 ) 00022 ( ) * PR^XN * (1-PR)^S 00023 ( S ) 00024 00025 00026 Arguments 00027 00028 00029 S --> The number of failures 00030 S is DOUBLE PRECISION 00031 00032 XN --> The number of successes 00033 XN is DOUBLE PRECISIO 00034 00035 PR --> The probability of success in each binomial trial. 00036 PR is DOUBLE PRECISIO 00037 00038 OMPR --> 1 - PR 00039 OMPR is DOUBLE PRECIS 00040 00041 CUM <-- Cumulative negative binomial distribution. 00042 CUM is DOUBLE PRECISI 00043 00044 CCUM <-- Compliment of Cumulative negative binomial distribution. 00045 CCUM is DOUBLE PRECIS 00046 00047 00048 Method 00049 00050 00051 Formula 26.5.26 of Abramowitz and Stegun, Handbook of 00052 Mathematical Functions (1966) is used to reduce the negative 00053 binomial distribution to the cumulative beta distribution. 00054 00055 ********************************************************************** 00056 */ 00057 { 00058 static double T1; 00059 /* 00060 .. 00061 .. Executable Statements .. 00062 */ 00063 T1 = *s+1.e0; 00064 cumbet(pr,ompr,xn,&T1,cum,ccum); 00065 return; 00066 } /* END */
