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variability

1 message · elisia

elisia
# 
I am analyzing the voice telephone traffic of some operators. In this type of
phenomenon is useful to consider the anomalies in the duration in minutes of
conversation but it is very important to take account of another variable:
average time of conversation, the relationship between the duration in
minutes of talk time and the number of such calls. 
Is there a way to get the values of the abnormal traffic based on these
variables? 
one can calculate an index of variability that represent the variability of
the duration of the conversation and the average time of conversation?