• 
• 39%
• 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 1 group with a statistically significant greater concentration than what we'd expect to see:

• 0-5 words: 38.9% (Avg. rating: 4.8)

In total, we found that 719 reviews (or 39%) 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.

• 
• 20%
• Substantial overlapping review history

361 of the 1,848 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.8 while the reviewers who have a more unique product review history 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 Overlapping Review History test.

• 
• 42%
• 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 6-15 Reviews: 42.5% (Avg. rating: 4.7)

In total, we found that 785 reviewers (or 42%) are within an overrepresented participation group. These reviews have rated this product an average of 4.7, while all other reviews have 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 Reviewer Participation test.

• 2
• Reviews have been deleted

We discovered a total of 2 deleted Reviews for this product, with an average rating of 5. 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

• 
• 6%
• Created over 14 days

We counted 1,848 reviews for this product over the span of 1,431 days, an average of 1.3 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day.

However, we see the following 14 days exceeding this threshold:

• 12 Reviews on Mar 21, 2019 (Avg. rating: 5.0)
• 11 Reviews on Oct 23, 2018 (Avg. rating: 4.5)
• 9 Reviews on Dec 4, 2017 (Avg. rating: 4.8)
• 9 Reviews on Jan 6, 2019 (Avg. rating: 4.7)
• 8 Reviews on Jan 11, 2018 (Avg. rating: 4.9)
• 8 Reviews on Jan 2, 2019 (Avg. rating: 4.9)
• 8 Reviews on Dec 6, 2018 (Avg. rating: 3.6)
• 8 Reviews on Apr 19, 2019 (Avg. rating: 3.6)
• 7 Reviews on Dec 1, 2018 (Avg. rating: 4.9)
• 7 Reviews on Dec 23, 2018 (Avg. rating: 4.7)
• 7 Reviews on Apr 13, 2019 (Avg. rating: 4.6)
• 7 Reviews on Oct 22, 2018 (Avg. rating: 4.3)
• 7 Reviews on Jan 26, 2019 (Avg. rating: 4.3)
• 7 Reviews on Mar 4, 2019 (Avg. rating: 3.9)
Show All

In total, we found that 115 reviews were created on just 14 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Rating Trend test.

• 
• 2%
• Unverified Purchases

40 of the 1,848 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%
• Used substantial repetitive phrases

0 of the 1,848 total reviews for this product use substantial repetitive phrases between them. 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 Phrase Repetition test.

One-Hit Wonders

• 
• 6%
• have only posted one review

114 of the 1,848 reviewers have only reviewed this product. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Never-Verified Reviewers

• 
• 1%
• have zero verified purchases

13 of the 1,848 reviewers have never written a verified purchase review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Take-Back Reviewers

• 
• 8%
• have previously deleted reviews

152 of the 1,848 reviewers have had at least one of their past reviews for another product deleted. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Single-Day Reviewers

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

80 of the 1,848 reviewers have written multiple reviews but posted all of them on a single day. 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 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 4.4. 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

• 
• 6%
• Reviewed other products from this brand

102 of the 1,848 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.