• 
• 11%
• Created over 19 days

We counted 2,834 reviews for this product over the span of 809 days, an average of 3.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 11 or fewer reviews on any given day.

However, we see the following 19 days exceeding this threshold:

• 27 Reviews on Sep 18, 2020 (Avg. rating: 4.6)
• 25 Reviews on Aug 26, 2020 (Avg. rating: 4.8)
• 23 Reviews on Sep 17, 2020 (Avg. rating: 4.7)
• 21 Reviews on Aug 25, 2020 (Avg. rating: 4.6)
• 18 Reviews on Dec 12, 2020 (Avg. rating: 4.7)
• 17 Reviews on Jan 14, 2020 (Avg. rating: 4.9)
• 16 Reviews on Sep 15, 2020 (Avg. rating: 4.9)
• 16 Reviews on Oct 14, 2019 (Avg. rating: 4.6)
• 16 Reviews on Jul 19, 2019 (Avg. rating: 4.4)
• 14 Reviews on Jan 5, 2021 (Avg. rating: 4.8)
• 14 Reviews on Jul 20, 2019 (Avg. rating: 4.7)
• 13 Reviews on Jan 7, 2020 (Avg. rating: 4.9)
• 13 Reviews on Jan 2, 2021 (Avg. rating: 4.6)
• 13 Reviews on Jan 3, 2021 (Avg. rating: 4.5)
• 12 Reviews on Sep 16, 2020 (Avg. rating: 4.9)
• 12 Reviews on Jul 17, 2019 (Avg. rating: 4.8)
• 12 Reviews on Mar 28, 2021 (Avg. rating: 4.8)
• 12 Reviews on Aug 21, 2020 (Avg. rating: 4.6)
• 12 Reviews on Oct 16, 2019 (Avg. rating: 4.2)
Show All

In total, we found that 306 reviews were created on just 19 days. The reviews on these high volume days have rated this product an average of 4.7 while reviews from other days have rated this product an average of 4.6. 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 Rating Trend test.

• 
• 13%
• Used substantial repetitive phrases

367 of the 2,834 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.8 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.

• 
• 11%
• Substantial overlapping review history

319 of the 2,834 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.7 while the reviewers who have a more unique product review history rated this product an average of 4.6. 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 Overlapping Review History test.

• 19
• Reviews have been deleted

We discovered a total of 19 deleted Reviews for this product, with an average rating of 4.4. 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

Brand Loyalists

• 
• 2%
• Reviewed mostly products from this brand

60 of the 2,834 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Brand Repeats test.

One-Hit Wonders

• 
• 11%
• have only posted one review

318 of the 2,834 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.

Read more about our Suspicious Reviewers 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 4.5, 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.

• 
• 57%
• 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:

• 6-15 words: 38.7% (Avg. rating: 4.6)
• 16-25 words: 18.6% (Avg. rating: 4.5)

In total, we found that 1,624 reviews (or 57%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

Read more about our Word Count Comparison test.

• 
• 89%
• From reviewers with an overrepresented participation

We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 1-5 Reviews: 37.7% (Avg. rating: 4.5)
• Reviewers with 6-15 Reviews: 36.5% (Avg. rating: 4.6)
• Reviewers with 16-30 Reviews: 14.9% (Avg. rating: 4.6)

In total, we found that 2525 reviewers (or 89%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

Read more about our Reviewer Participation test.

• 
• 1%
• Unverified Purchases

32 of the 2,834 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.

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

1 of the 2,834 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. 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 Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.