• 
• 98%
• Created over 6 days

We counted 6,948 reviews for this product over the span of 51 days, an average of 136.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 177 or fewer reviews on any given day.

However, we see the following 6 days exceeding this threshold:

• 2208 Reviews on Mar 6, 2019 (Avg. rating: 5.0)
• 1725 Reviews on Feb 20, 2019 (Avg. rating: 5.0)
• 1059 Reviews on Mar 7, 2019 (Avg. rating: 5.0)
• 1043 Reviews on Jan 15, 2019 (Avg. rating: 5.0)
• 484 Reviews on Feb 9, 2019 (Avg. rating: 5.0)
• 266 Reviews on Mar 3, 2019 (Avg. rating: 5.0)

In total, we found that 6,785 reviews were created on just 6 days. The reviews on these high volume days have rated this product an average of 5.0 while reviews from other days have rated this product an average of 3.8. 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.

• 
• 99%
• Unverified Purchases

6,890 of the 6,948 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 5.0 while the verified purchasers have rated this product an average of 1.5. 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.

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.

One-Hit Wonders

• 
• 15%
• have only posted one review

1,026 of the 6,948 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.

Never-Verified Reviewers

• 
• 76%
• have zero verified purchases

5,308 of the 6,948 reviewers have never written a verified purchase review. This is an excessively large percentage of Never-Verified Reviewers which may indicate unnatural reviews.

Take-Back Reviewers

• 
• 20%
• have previously deleted reviews

1,393 of the 6,948 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

Single-Day Reviewers

• 
• 49%
• have posted all their reviews on a single day

3,436 of the 6,948 reviewers have written multiple reviews but posted all of them on a single day. This is an excessively large percentage of Single-Day Reviewers which may indicate 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 4.9, 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.

• 
• 83%
• Substantial overlapping review history

5,768 of the 6,948 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 5.0 while the reviewers who have a more unique product review history rated this product an average of 4.8. 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.

Brand Loyalists

• 
• 3%
• Reviewed mostly products from this brand

207 of the 6,948 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, it does not appear to have a significant impact on the overall rating.

Read more about our Brand Repeats test.

• 
• 73%
• 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:

• 41-65 words: 47.2% (Avg. rating: 5.0)
• 66-100 words: 25.6% (Avg. rating: 5.0)

In total, we found that 5,056 reviews (or 73%) 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.

• 
• 27%
• Used substantial repetitive phrases

1,849 of the 6,948 total reviews for this product use substantial repetitive phrases between them. While this is more than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Read more about our Phrase Repetition test.

• 
• 53%
• From reviewers with an overrepresented participation

We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:

• Reviewers with 1-5 Reviews: 36.1% (Avg. rating: 4.9)
• Reviewers with 101-200 Reviews: 16.7% (Avg. rating: 5.0)

In total, we found that 3669 reviewers (or 53%) 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.

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

13 of the 6,948 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.

• 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.