• 
• 13%
• Created over 35 days

We counted 2,023 reviews for this product over the span of 3,063 days, an average of 0.7 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 35 days exceeding this threshold:

• 14 Reviews on Dec 2, 2020 (Avg. rating: 4.9)
• 14 Reviews on Nov 30, 2020 (Avg. rating: 4.9)
• 10 Reviews on Dec 3, 2020 (Avg. rating: 5.0)
• 10 Reviews on Dec 5, 2020 (Avg. rating: 4.6)
• 10 Reviews on Nov 28, 2020 (Avg. rating: 4.1)
• 9 Reviews on Jan 13, 2019 (Avg. rating: 4.9)
• 9 Reviews on Dec 8, 2018 (Avg. rating: 4.8)
• 9 Reviews on Apr 10, 2019 (Avg. rating: 4.8)
• 8 Reviews on Nov 20, 2020 (Avg. rating: 4.9)
• 8 Reviews on Nov 29, 2020 (Avg. rating: 4.8)
• 8 Reviews on Dec 11, 2020 (Avg. rating: 4.6)
• 8 Reviews on Dec 1, 2020 (Avg. rating: 4.5)
• 7 Reviews on Dec 21, 2018 (Avg. rating: 5.0)
• 7 Reviews on Sep 7, 2019 (Avg. rating: 5.0)
• 7 Reviews on Nov 14, 2020 (Avg. rating: 5.0)
• 7 Reviews on Oct 25, 2019 (Avg. rating: 4.9)
• 7 Reviews on Dec 13, 2020 (Avg. rating: 4.7)
• 7 Reviews on Dec 6, 2018 (Avg. rating: 4.7)
• 7 Reviews on Dec 4, 2020 (Avg. rating: 4.6)
• 7 Reviews on Jul 2, 2019 (Avg. rating: 4.4)
• 6 Reviews on Nov 27, 2018 (Avg. rating: 5.0)
• 6 Reviews on Apr 22, 2020 (Avg. rating: 5.0)
• 6 Reviews on Jan 15, 2019 (Avg. rating: 5.0)
• 6 Reviews on Jan 5, 2019 (Avg. rating: 5.0)
• 6 Reviews on Dec 29, 2018 (Avg. rating: 5.0)
• 6 Reviews on Nov 30, 2018 (Avg. rating: 5.0)
• 6 Reviews on Nov 17, 2020 (Avg. rating: 4.8)
• 6 Reviews on Sep 4, 2020 (Avg. rating: 4.8)
• 6 Reviews on Dec 26, 2018 (Avg. rating: 4.8)
• 6 Reviews on Nov 26, 2020 (Avg. rating: 4.7)
• 6 Reviews on Dec 7, 2020 (Avg. rating: 4.7)
• 6 Reviews on Mar 7, 2019 (Avg. rating: 4.5)
• 6 Reviews on Dec 15, 2018 (Avg. rating: 4.3)
• 6 Reviews on Nov 24, 2019 (Avg. rating: 4.3)
• 6 Reviews on Dec 10, 2018 (Avg. rating: 4.2)
Show All

In total, we found that 263 reviews were created on just 35 days. The reviews on these high volume days have rated this product an average of 4.8 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.

Take-Back Reviewers

• 
• 15%
• have previously deleted reviews

306 of the 2,023 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.7 while the reviewers who don't have any deleted reviews in their history 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.

Single-Day Reviewers

• 
• 4%
• have posted all their reviews on a single day

76 of the 2,023 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 4.6. 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 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. 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.

• 
• 65%
• 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: 39.3% (Avg. rating: 4.8)
• 6-15 words: 25.4% (Avg. rating: 4.6)

In total, we found that 1,308 reviews (or 65%) are within an overrepresented word count group. These reviews have rated this product an average of 4.8, 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.

• 
• 14%
• Used substantial repetitive phrases

289 of the 2,023 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 4.6. 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 Phrase Repetition test.

• 
• 22%
• Substantial overlapping review history

439 of the 2,023 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.

• 
• 4%
• Unverified Purchases

78 of the 2,023 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.

• 
• 0%
• From reviewers with an overrepresented participation

We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.

Brand Repeaters

• 
• 19%
• Reviewed other products from this brand

393 of the 2,023 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.

• 0
• Reviews have been deleted

We have not discovered any deleted reviews for this product.

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.