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G-OAssistant Commandant for Operations
G-OGoel-Okumoto (softwar reliability growth model)
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References in periodicals archive ?
In the classical Goel-Okumoto SRGM, the independent variable, that is, time "f," is replaced with log-power testing effort function "W(t)" by applying the time transformation as applicable to NHPP models [20].
If W(t) is the log-power testing effort spent at time t then the mean value function [mu](t) of the Goel-Okumoto model can be transformed as given below:
The estimation results show that the proposed model well fits the real observations and performs better than the traditional Goel-Okumoto model and the Yamada delayed S-shaped model.
We further note that when k = 0, [p.sub.1] = 1, and [p.sub.2] = [p.sub.3] = 0, the original Goel-Okumoto model can be realized [31]; that is,
They correspond to our proposed model, the Goel-Okumoto model, the No-k model, the Only-G1 model, and the Yamada delayed S-shaped, respectively.
By comparing with the Goel-Okumoto model, the Yamada delayed S-shaped model, the No-k model, and the Only-G1 model, [R.sup.2] values are the highest in our proposed model.
It is also much higher than those in the Goel-Okumoto model, the Yamada delayed S-shaped model, the No-k model, and the Only-G1 model.
The first case corresponds to the No-k model (14), the second case corresponds to the Only-G1 model (15), and the third case is just the Goel-Okumoto model (13).
As an example, we compare the Goel-Okumoto model and our proposed model when the type-I reliability definition is adopted and a is set as 95%.
Alternatively, when the type-II reliability definition is adopted, the Goel-Okumoto model predicts the best release time as 132.2 while that for our proposed model is 66.75, which suggests that the testing duration in our model is doubled compared with traditional Goel-Okumoto model.
Moreover, our proposed model recommends an earlier release time and a reduced cost compared with the Goel-Okumoto model and the Yamada delayed S-shaped model.
Solid line: our proposed mode; dot line: the Only-G1 model; dash-dot line: the Nok model; dash line: the Goel-Okumoto model.