June 2020
Intermediate to advanced
382 pages
11h 39m
English
Content preview from 40 Algorithms Every Programmer Should Know
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Support
The support measure is a number that quantifies how frequent the pattern we are looking for is in our dataset. It is calculated by first counting the number of occurrences of our pattern of interest and then dividing it by the total number of all the transactions.
Let's look at the following formula for a particular itemseta:
numItemseta = Number of transactions that contain itemseta
numtotal = Total number of transactions
By just looking at the support, we can get an idea of how rare the occurrence of a pattern is. A low support means that we are looking for a rare event.
For example, if itemseta = {helmet, ball} appears in two transactions ...
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