Information Technology Reference
In-Depth Information
F IG . 5. An operational profile (OP) of requested file types for the SMU/SEAS web site.
There are also several other key points worth noting about Musa OPs, including:
It is customary to sort the operations by descending probabilities of usage and
present the results in that order. This sorted OP is often represented visually as
a histogram, such as in Fig. 5 , to make the results easy to interpret.
It is common to have quite uneven distribution of usage probabilities, with a
few frequently used ones account for most of the usage frequencies. In Table II ,
the top 13 out of a hundred or so file types account for more than 98% of the
web hits for SMU/SEAS.
Related to the uneven distribution of usage probabilities is the probability
threshold for individual operations. The basis of statistical testing is to perform
more testing for those operations that are used more by the customers. There-
fore, if some operations have very low probability of usage, we could omit
them in the OP. This probability threshold plays an important role in limiting
the numbers of operations to represent in the OP, especially when there are a
large number of possible operations.
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