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sourcestats: add lower bound for std dev used for weighting

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Miroslav Lichvar
2016-12-13 12:50:59 +01:00
parent 95a4f33265
commit 5bc53741be
1 changed files with 4 additions and 2 deletions
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6
sourcestats.c
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@@ -50,6 +50,9 @@
/* The minimum allowed skew */ /* The minimum allowed skew */
#define MIN_SKEW 1.0e-12 #define MIN_SKEW 1.0e-12
/* The minimum assumed std dev for weighting */
#define MIN_WEIGHT_SD 1.0e-9
/* The asymmetry of network jitter when all jitter is in one direction */ /* The asymmetry of network jitter when all jitter is in one direction */
#define MAX_ASYMMETRY 0.5 #define MAX_ASYMMETRY 0.5
@@ -507,8 +510,7 @@ SST_DoNewRegression(SST_Stats inst)
/* And now, work out the weight vector */ /* And now, work out the weight vector */
sd = mean_distance - min_distance; sd = mean_distance - min_distance;
if (sd > min_distance || sd <= 0.0) sd = CLAMP(MIN_WEIGHT_SD, sd, min_distance);
sd = min_distance;
for (i=0; i<inst->n_samples; i++) { for (i=0; i<inst->n_samples; i++) {
sd_weight = 1.0 + SD_TO_DIST_RATIO * (peer_distances[i] - min_distance) / sd; sd_weight = 1.0 + SD_TO_DIST_RATIO * (peer_distances[i] - min_distance) / sd;