diff options
| -rw-r--r-- | crosperf/benchmark.py | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/crosperf/benchmark.py b/crosperf/benchmark.py index 55673a56..3f0a842a 100644 --- a/crosperf/benchmark.py +++ b/crosperf/benchmark.py @@ -30,7 +30,10 @@ def _samples(b): if b not in _estimated_stddev: return 1 d = _estimated_stddev[b] - return int(math.ceil((stats.norm.isf((1 - p) / 2) * d / e) ** 2)) + # Get at least 2 samples so as to calculate standard deviation, which is + # needed in T-test for p-value. + n = int(math.ceil((stats.norm.isf((1 - p) / 2) * d / e) ** 2)) + return n if n > 1 else 2 class Benchmark(object): """Class representing a benchmark to be run. |