“…The first data set is given by Aarset (1987) and represents the time to first failure of 50 devices (in weeks). This data set is: 0.1, 0.2, 1, 1, 1, 1, 1, 2, 3,6,7,11,12,18,18,18,18,18,21,32,36,40,45,46,47,50,55,60,63,63,67,67,67,67,72,75,79,82,82,83,84,84,84,85,85,85,85,85,86,86. The TTT-plot of this data set, in Figure 3(a), shows a convex shape followed by a concave shape.…”