Calculate the "Median ranking" using this formula Benard’s formula
Time to failure |
Sequence / Order |
No |
Median Rank |
---|---|---|---|
16 |
1 |
6 |
0.109 |
34 |
2 |
6 |
0.265 |
53 |
3 |
6 |
0.421 |
75 |
4 |
6 |
0.578 |
93 |
5 |
6 |
0.734 |
120 |
6 |
6 |
0.890 |
After calculating the median ranking, you can now place the points on the x and y-axis as follows:
-
X axis =
-
Y axis =
x |
y |
x*y |
|
---|---|---|---|
1 |
2.772589 |
-2.155616 |
-5.97664 |
2 |
3.526361 |
-1.1752704 |
-4.14443 |
3 |
3.970292 |
-0.6015436 |
-2.3883 |
4 |
4.317488 |
-0.147287 |
-0.63591 |
5 |
4.532599 |
0.2819178 |
1.27782 |
6 |
4.787492 |
0.79433683 |
3.802881 |
Σ |
23.90682 |
-3.0034624 |
-8.06458 |
The slope of the line (β) is based on linear regression using the least square method:
The intercept with the y-axis can now be determined as follows:
Scale parameter η therefore =