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Searched refs:variance (Results 1 – 3 of 3) sorted by relevance

/tools/perf/util/
A Dbpf-trace-summary.c76 double variance, average; in rel_stddev() local
83 variance = stat->squared_sum; in rel_stddev()
84 variance -= (stat->total_time * stat->total_time) / stat->count; in rel_stddev()
85 variance /= stat->count - 1; in rel_stddev()
87 return 100 * sqrt(variance / stat->count) / average; in rel_stddev()
A Dstat.c59 double variance, variance_mean; in stddev_stats() local
64 variance = stats->M2 / (stats->n - 1); in stddev_stats()
65 variance_mean = variance / stats->n; in stddev_stats()
/tools/perf/Documentation/
A Dperf-stat.txt629 - optional variance if multiple values are collected with -r
654 - variance : optional variance if multiple values are collected (with -r)

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