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CTR — click through rate
clicks / impressions
Conversion rate
conversions / visitors
LTV — customer lifetime value
avg purchase value x purchase frequency x time
ROI — return on investment
(rev - cost) / cost
FPR — false positive rate
FP / (FP+TN)
FNR — false negative rate
FN / (FN+TP)
Mean
sum of values / num of values
Median
middle value (sorted list)
Mode
most frequent value
|E|
(% change in Q demanded) / (% change in P)
measures how sensitive customers are to price changes
|E| > 1
= elastic —> customers react strongly
|E| < 1
= inelastic —> customers are less responsive