In general, it is well known that the occurrences of the data packet dropout at two iterations are independent of each other.
Missing values are treated by the two algorithms using different strategies: C4.5 splits the training data instances to the leaves of the decision tree proportionally to the occurrence of missing data in the data set.
Here, we employ a previously used frequency histogram method of obtaining the probability distribution where pi represents the probability the occurrence of a data point within the ith bin [34].
For example, the data x1,2,3,4 and x1,2,3,5 can be combined into x1,2,3, and the data x1,2,3,4 and x1,1,2,3 are combined into x1; the combination is to find the maximum number of occurrences of the original data.
The test employs the ratio of likelihood, comparing the occurrence of data across the two models.
This cut-off, although relatively high, was optimized to reduce the occurrence of false negative data in data sets interrogating a small number of gene sets.
The occurrence of missing data in the other 9 patients was less than 5%, and in these circumstances the last value was carried forward [ 21].
Figure 3 shows the size of aggregates versus the frequency of their occurrence in the data set.
Because a distribution function graphs the relative occurrence of data points, the mode will naturally be in the exact middle of a symmetrical distribution curve, as this is the highest point on the graph and corresponds to the most common value.
If the occurrence of missing data is not random with respect to the morphology of the individuals, then removing individuals will reduce the variability that this study is seeking to quantify.
