• 1,796
• Reviews have been deleted

We discovered a total of 1,796 deleted Reviews for this product, with an average rating of 4.6. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.

There are a few limitations to keep in mind regarding the Deleted Reviews test:

1. We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
2. We have no information on reviews that were never published in the first place.
3. We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.

Read more about our Deleted Reviews test.

Show distribution of deleted reviews

One-Hit Wonders

• 
• 11%
• have only posted one review

181 of the 1,661 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Single-Day Reviewers

• 
• 6%
• have posted all their reviews on a single day

107 of the 1,661 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.8 while all other reviewers rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

Read more about our Suspicious Reviewers test.

• 
• 62%
• Have an overrepresented word count

In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 2 groups with a statistically significant greater concentration than what we'd expect to see:

• 0-5 words: 28.7% (Avg. rating: 4.8)
• 6-15 words: 33.1% (Avg. rating: 4.5)

In total, we found that 1,025 reviews (or 62%) are within an overrepresented word count group. These reviews have rated this product an average of 4.6, while all other reviews have rated this product an average of 4.4. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

Read more about our Word Count Comparison test.

• 
• 2%
• Used substantial repetitive phrases

28 of the 1,661 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 5.0 while reviews without substantial repetitive phrases rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

Read more about our Phrase Repetition test.

• 
• 8%
• Created over 24 days

We counted 1,661 reviews for this product over the span of 2,791 days, an average of 0.6 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 24 days exceeding this threshold:

• 9 Reviews on Apr 26, 2017 (Avg. rating: 4.3)
• 8 Reviews on Apr 5, 2017 (Avg. rating: 4.8)
• 7 Reviews on Sep 16, 2017 (Avg. rating: 4.1)
• 6 Reviews on Aug 23, 2017 (Avg. rating: 5.0)
• 6 Reviews on Jun 1, 2020 (Avg. rating: 5.0)
• 6 Reviews on Jun 14, 2020 (Avg. rating: 5.0)
• 6 Reviews on Feb 15, 2017 (Avg. rating: 4.8)
• 6 Reviews on Jul 14, 2019 (Avg. rating: 4.8)
• 5 Reviews on Jun 18, 2019 (Avg. rating: 5.0)
• 5 Reviews on Jan 17, 2020 (Avg. rating: 5.0)
• 5 Reviews on Jun 12, 2020 (Avg. rating: 5.0)
• 5 Reviews on Sep 13, 2014 (Avg. rating: 4.8)
• 5 Reviews on Apr 7, 2017 (Avg. rating: 4.8)
• 5 Reviews on Jan 12, 2018 (Avg. rating: 4.8)
• 5 Reviews on Apr 30, 2020 (Avg. rating: 4.8)
• 5 Reviews on Apr 24, 2017 (Avg. rating: 4.6)
• 5 Reviews on Jan 16, 2015 (Avg. rating: 4.4)
• 5 Reviews on Feb 20, 2018 (Avg. rating: 4.4)
• 5 Reviews on Jul 6, 2018 (Avg. rating: 4.4)
• 5 Reviews on Aug 15, 2017 (Avg. rating: 4.2)
• 5 Reviews on Jul 25, 2018 (Avg. rating: 4.2)
• 5 Reviews on Oct 16, 2018 (Avg. rating: 4.2)
• 5 Reviews on Dec 3, 2018 (Avg. rating: 4.0)
• 5 Reviews on May 19, 2017 (Avg. rating: 3.8)
Show All

In total, we found that 134 reviews were created on just 24 days. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Rating Trend test.

• 
• 35%
• From reviewers with an overrepresented participation

We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 1-5 Reviews: 35.3% (Avg. rating: 4.4)

In total, we found that 587 reviewers (or 35%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Reviewer Participation test.

• 
• 6%
• Unverified Purchases

102 of the 1,661 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.

• 
• 11%
• Substantial overlapping review history

183 of the 1,661 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Read more about our Overlapping Review History test.

The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.4, while the average ease score for reviewers in this category is 4.3. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

Brand Repeaters

• 
• 2%
• Reviewed other products from this brand

37 of the 1,661 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Read more about our Brand Repeats test.

On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.

• 
• 0%
• Admitted to receiving an incentive

We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.