The coverage fluctuations and expected length of the externally randomized split sample Wilson, U(−1/2, 1/2) Wilson
and Stevens intervals are compared in Fig. 3. The U(−1/2, 1/2) interval improves upon the split sample interval about as
much as the split sample interval improves upon the standard Wilson interval. Unlike the split sample and U(−1/2, 1/2)
intervals, the Stevens interval has coverage exactly equal to 1−α for all values of p, so that there are no coverage oscillations
at all. The difference in expected length between the intervals is quite small for all combinations of p and n and is decreasing
in n. The Stevens interval is shorter when p is close to 0 or 1, but wider when p is close to 1/2. When n = 20 the difference
in expected length is at most 0.018 and when n = 100 it is at most 0.002.
Apart from coverage, one can also consider interval location measured by directions of non-coverage, as described in
Newcombe (2011). We mention here briefly that based on an extensive simulation study, we have seen that the split sample
The coverage fluctuations and expected length of the externally randomized split sample Wilson, U(−1/2, 1/2) Wilsonand Stevens intervals are compared in Fig. 3. The U(−1/2, 1/2) interval improves upon the split sample interval about asmuch as the split sample interval improves upon the standard Wilson interval. Unlike the split sample and U(−1/2, 1/2)intervals, the Stevens interval has coverage exactly equal to 1−α for all values of p, so that there are no coverage oscillationsat all. The difference in expected length between the intervals is quite small for all combinations of p and n and is decreasingin n. The Stevens interval is shorter when p is close to 0 or 1, but wider when p is close to 1/2. When n = 20 the differencein expected length is at most 0.018 and when n = 100 it is at most 0.002.Apart from coverage, one can also consider interval location measured by directions of non-coverage, as described inNewcombe (2011). We mention here briefly that based on an extensive simulation study, we have seen that the split sample
การแปล กรุณารอสักครู่..
