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Length: 537 (0x219)
Types: TextFile
Names: »centile.c«
└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
└─⟦this⟧ »EUUGD11/stat-5.3/eu/stat/src/centile.c«
/* Copyright 1980 Gary Perlman */
/*LINTLIBRARY*/
#include "stat.h"
FUN(centile,compute values given percentile rank,5.0,12/24/86)
/*returns the perc percentile of sorted v[n]*/
double
centile (perc, v, n) float v[]; int perc, n;
{
double findex; /* floating index to the perc centile */
int pindex;
findex = perc * .01 * n - 0.5;
if (findex < 0.0)
findex = 0.0;
else if (findex > (n-1.0))
findex = n - 1.0;
pindex = (int) findex;
return (v[pindex+1] * (findex - pindex) +
v[pindex] * (1.0 - findex + pindex));
}