The way the popularity filter is calculated is based on the number of times a particular item was clicked on across keyword searches and the position that the item displayed on the page during the clicksat the time it was clicked on. At anytime we only look at the data for the last 30 days for this feature.
We recommend that you keep the value between 0 and 1 because we want to ensure that for the search results result's relevancy still has an a strong impact on the ordering and order the items are displayed in. This helps safeguard that an item does not appear on top just because of popularitybecause it is popular, even though it is not necessarily the most relevant search term. In essence, the score should always have more impact weight on the order than on the popularity for search requests. For example, let's say a user searches for keyword "watch". A watch accessory appears in the result, but because people end up so does a replacement watch band. Perhaps users have been clicking on the watch accessory more in the last 30 days, so now the accessory might start coming on displaying at the top of the results if the Learning Search Multiplier has been set to favor popularity. This is undesirable since it is a less relevant result for the keyword "watch" and most likely is a lower priced item than an actual watch, thus these results might be deemed undesirable.
It is also valuable to set the value greater than zero so that popularity is able to play a role in the display order. When you are navigating using the left navigation or top navigation, relevancy will not matter searching by department, relevancy doesn't play an important role as you are using navigation as opposed to keywords. However, in this case since the items within the searched department will have the same score, For example, if you search a category, all items that will return will have the same category and will match the same score. However, in this case if the popularity metric is turned on, the items that are more popular will come display closer to the top regardless of the popularity setting being at 1 or 3. We recommend that you turn this feature on in the staging account and ensure that the dev site is connected to our the staging site so they can run tests on thisfor testing.
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