VOCF: Vocabulary Frequency corresponds to the average number of times the vocabulary is used (sum of distinct operands and operators) in a component. This metric is calculated as follows: VOCF = (N1+N2)/ (n1+n2)
N1 = Sum of all operators
N2 = Sum of all operands
n1 = Number of different operators
n2 = Number of different operands
HIS definition:
"The language scope is an indicator of the cost of maintaining/changing functions.
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