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| author | Andriy Gapon <avg@FreeBSD.org> | 2017-04-14 15:31:04 +0000 |
|---|---|---|
| committer | Andriy Gapon <avg@FreeBSD.org> | 2017-04-14 15:31:04 +0000 |
| commit | 5ad79d9b2037c0676aab1c92f9f6ac7fb77c9a97 (patch) | |
| tree | b6e32aba0597c8d41b3ee8dcf787b66f2024ab48 /cddl | |
| parent | f4247773faa2a6765a29ed04339d722998e28bd4 (diff) | |
| download | src-test2-5ad79d9b2037c0676aab1c92f9f6ac7fb77c9a97.tar.gz src-test2-5ad79d9b2037c0676aab1c92f9f6ac7fb77c9a97.zip | |
Notes
Diffstat (limited to 'cddl')
| -rw-r--r-- | cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c index de574a330268..62c120388b18 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c @@ -389,8 +389,10 @@ dt_stddev(uint64_t *data, uint64_t normal) * The standard approximation for standard deviation is * sqrt(average(x**2) - average(x)**2), i.e. the square root * of the average of the squares minus the square of the average. + * When normalizing, we should divide the sum of x**2 by normal**2. */ dt_divide_128(data + 2, normal, avg_of_squares); + dt_divide_128(avg_of_squares, normal, avg_of_squares); dt_divide_128(avg_of_squares, data[0], avg_of_squares); norm_avg = (int64_t)data[1] / (int64_t)normal / (int64_t)data[0]; |