Conversion Rates are an indicator for the increased purchase probability due to the usage of the Size Advisor - which leads to a decreased insecurity about sizing of visitors.
Average Revenue per Visitor
The Average Revenue per Visitor incorporates effects on changed spending behaviour (e.g. more products or more expensive products are bought). Typically the Average Revenue per Visitor gives a more comprehensive picture as this KPI measures how much more revenue is generated per customer through use of the Size Advisor.
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