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Chapter 11: Summarization (reduces # of columns & rows (creates…
Chapter 11: Summarization
reduces # of columns & rows
creates virtual "bucket" for each unique group
possible to summarize multiple columns
common functions used:
count
sum
min
max
first
last
average
median
1 more item...
crosstab
uses content from columns to create new columns
skinny table is common
crosstab helps make data useful
helps develop patterns of customers
creates larger tables useful for ML