Software Reliability ◾ 525
issues of bias and noise as they are dened in this chapter. Does the
situation improve if you change the prediction system by
a. Basing your prediction of the mean on the average of the three
previously observed t
i
s ?
b. Basing your prediction of the mean on just the one previously
observed t
i
?
8. Example 11.14 shows how to compute the sequence of prequential
likelihood values for the prediction system of Example 11.9 using the
data in Table 11.1. Call this prediction system A. Repeat the compu-
tations for the prediction system B where the estimate of the mean
time to the next failure is the average of the three previously observed
values. Now, you can compute both PL(A)/PL(B) and PL(B)/PL(A)
for a number ...