• 
• 19%
• Created over 34 days

We counted 1,287 reviews for this product over the span of 2,112 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 34 days exceeding this threshold:

• 14 Reviews on May 19, 2012 (Avg. rating: 2.1)
• 12 Reviews on May 16, 2012 (Avg. rating: 3.5)
• 12 Reviews on May 28, 2012 (Avg. rating: 2.1)
• 11 Reviews on May 20, 2012 (Avg. rating: 2.9)
• 9 Reviews on Sep 6, 2012 (Avg. rating: 3.1)
• 9 Reviews on May 15, 2012 (Avg. rating: 2.9)
• 9 Reviews on May 29, 2012 (Avg. rating: 2.7)
• 9 Reviews on May 18, 2012 (Avg. rating: 2.6)
• 9 Reviews on May 17, 2012 (Avg. rating: 2.4)
• 8 Reviews on May 25, 2012 (Avg. rating: 3.3)
• 8 Reviews on Jun 12, 2012 (Avg. rating: 2.9)
• 8 Reviews on May 30, 2012 (Avg. rating: 2.5)
• 8 Reviews on Jun 2, 2012 (Avg. rating: 2.5)
• 7 Reviews on Jul 5, 2012 (Avg. rating: 3.0)
• 7 Reviews on May 26, 2012 (Avg. rating: 2.3)
• 7 Reviews on Jun 13, 2012 (Avg. rating: 1.4)
• 6 Reviews on Nov 30, 2012 (Avg. rating: 3.8)
• 6 Reviews on Dec 30, 2012 (Avg. rating: 3.8)
• 6 Reviews on Dec 9, 2012 (Avg. rating: 3.7)
• 6 Reviews on Sep 7, 2012 (Avg. rating: 3.5)
• 6 Reviews on Dec 31, 2012 (Avg. rating: 3.5)
• 6 Reviews on Jul 8, 2012 (Avg. rating: 3.2)
• 6 Reviews on May 21, 2012 (Avg. rating: 3.2)
• 6 Reviews on Jun 24, 2012 (Avg. rating: 2.7)
• 6 Reviews on May 27, 2012 (Avg. rating: 1.7)
• 5 Reviews on May 24, 2012 (Avg. rating: 3.6)
• 5 Reviews on Oct 6, 2012 (Avg. rating: 3.4)
• 5 Reviews on Dec 1, 2012 (Avg. rating: 3.4)
• 5 Reviews on Dec 24, 2012 (Avg. rating: 3.4)
• 5 Reviews on Jan 2, 2013 (Avg. rating: 3.2)
• 5 Reviews on Jun 4, 2012 (Avg. rating: 2.8)
• 5 Reviews on Jul 23, 2012 (Avg. rating: 2.8)
• 5 Reviews on Jun 23, 2012 (Avg. rating: 2.4)
• 5 Reviews on Nov 5, 2012 (Avg. rating: 2.2)
Show All

In total, we found that 246 reviews were created on just 34 days. The reviews on these high volume days have rated this product an average of 2.8 while reviews from other days have rated this product an average of 3.7. 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.

• 
• 35%
• Unverified Purchases

448 of the 1,287 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.0 while the verified purchasers 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.

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.

Take-Back Reviewers

• 
• 12%
• have previously deleted reviews

157 of the 1,287 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.

Read more about our Suspicious Reviewers test.

• 
• 2%
• Used substantial repetitive phrases

31 of the 1,287 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.0 while reviews without substantial repetitive phrases rated this product an average of 3.5. 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.

• 
• 22%
• Substantial overlapping review history

289 of the 1,287 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 3.8 while the reviewers who have a more unique product review history rated this product an average of 3.4. 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 Overlapping Review History test.

Brand Repeaters

• 
• 27%
• Reviewed other products from this brand

353 of the 1,287 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, the discrepancy in ratings between the Brand Repeaters and non-repeaters isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Brand Repeats test.

• 
• 0%
• Have an overrepresented word count

We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.

• 
• 22%
• 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: 22.5% (Avg. rating: 3.4)

In total, we found that 289 reviewers (or 22%) are within an overrepresented participation group. 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 Reviewer Participation 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, while the average ease score for reviewers in this category is 4.3.

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.