Source: Ripen eCommerce
Notes: While no single factor has a very strong correlation with search rankings, Amazon’s sales rank has the highest correlation with search success on the platform, according to an analysis from Ripen eCommerce, which also found that products in the top 1% of sales rank appeared on average in 8.7 different search queries (compared to 2.2 queries for the average product). Interestingly, the study found that fulfillment had some correlation with search rankings, with products sold by Amazon and with Prime eligibility exhibiting a higher correlation than those fulfilled by third party merchants.
As always, the study cautions that correlation does not equal causation!
About the Data: The Ripen eCommerce analysis was based on more than 746,500 search results for 16,930 keywords. The strength of each ranking signal was determined by using the mean of Spearman correlations between each ranking factor and SERP. Full details on how keywords were chosen and data extracted can be found here.