50 lines
2 KiB
Text
50 lines
2 KiB
Text
$FreeBSD$
|
|
|
|
A small tool to do the statistics legwork on benchmarks etc.
|
|
|
|
Prepare your data into two files, one number per line
|
|
run
|
|
./ministat data_before data_after
|
|
|
|
and see what it says.
|
|
|
|
You need at least three data points in each data set, but the more
|
|
you have the better your result generally gets.
|
|
|
|
Here are two typical outputs:
|
|
|
|
x _1
|
|
+ _2
|
|
+--------------------------------------------------------------------------+
|
|
|x + x+ x x x + ++ |
|
|
| |_________|______AM_______________|__A___________M_______________||
|
|
+--------------------------------------------------------------------------+
|
|
N Min Max Median Avg Stddev
|
|
x 5 36060 36138 36107 36105.6 31.165686
|
|
+ 5 36084 36187 36163 36142.6 49.952978
|
|
No difference proven at 95.0% confidence
|
|
|
|
Here nothing can be concluded from the numbers. It _may_ be possible to
|
|
prove something if many more measurements are made, but with only five
|
|
measurements, nothing is proven.
|
|
|
|
|
|
x _1
|
|
+ _2
|
|
+--------------------------------------------------------------------------+
|
|
| + |
|
|
| x + +|
|
|
|x x x x + +|
|
|
| |_______________A_____M_________| |_M___A____| |
|
|
+--------------------------------------------------------------------------+
|
|
N Min Max Median Avg Stddev
|
|
x 5 0.133 0.137 0.136 0.1354 0.0015165751
|
|
+ 5 0.139 0.14 0.139 0.1394 0.00054772256
|
|
Difference at 95.0% confidence
|
|
0.004 +/- 0.00166288
|
|
2.95421% +/- 1.22812%
|
|
(Student's t, pooled s = 0.00114018)
|
|
|
|
Here we have a clearcut difference, not very big, but clear and unambiguous.
|
|
|
|
|