Question: Question 4 1 0 Points What is the main reason why it is hard to measure the ClickThrough Rate ( CTR ) ? CTR needs
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What is the main reason why it is hard to measure the ClickThrough Rate CTR
CTR needs data on how many times an ad was clicked, but to do this, we may need to show a possibly worthless ad
It requires expensive computation.
It cannot be computed in realtime.
The CTR will be less certain over time.
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