• 
• 42%
• Created over 23 days

We counted 504 reviews for this product over the span of 2,915 days, an average of 0.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 3 or fewer reviews on any given day.

However, we see the following 23 days exceeding this threshold:

• 25 Reviews on Nov 9, 2010 (Avg. rating: 3.5)
• 23 Reviews on Nov 12, 2010 (Avg. rating: 2.0)
• 20 Reviews on Nov 11, 2010 (Avg. rating: 2.3)
• 18 Reviews on Nov 10, 2010 (Avg. rating: 3.6)
• 14 Reviews on Nov 15, 2010 (Avg. rating: 3.5)
• 14 Reviews on Nov 14, 2010 (Avg. rating: 2.8)
• 12 Reviews on Nov 13, 2010 (Avg. rating: 2.8)
• 9 Reviews on Nov 17, 2010 (Avg. rating: 2.9)
• 8 Reviews on Nov 16, 2010 (Avg. rating: 2.9)
• 8 Reviews on Nov 18, 2010 (Avg. rating: 2.6)
• 6 Reviews on Nov 25, 2010 (Avg. rating: 3.7)
• 6 Reviews on Dec 11, 2010 (Avg. rating: 3.7)
• 5 Reviews on Nov 24, 2010 (Avg. rating: 3.6)
• 5 Reviews on Dec 12, 2010 (Avg. rating: 3.6)
• 5 Reviews on Dec 15, 2010 (Avg. rating: 3.2)
• 5 Reviews on Nov 21, 2010 (Avg. rating: 3.0)
• 5 Reviews on Dec 1, 2010 (Avg. rating: 2.4)
• 5 Reviews on Nov 23, 2010 (Avg. rating: 2.0)
• 4 Reviews on Nov 29, 2010 (Avg. rating: 4.3)
• 4 Reviews on Dec 2, 2010 (Avg. rating: 4.0)
• 4 Reviews on Dec 31, 2010 (Avg. rating: 3.3)
• 4 Reviews on Dec 14, 2010 (Avg. rating: 2.0)
• 4 Reviews on Dec 10, 2010 (Avg. rating: 1.5)
Show All

In total, we found that 213 reviews were created on just 23 days. The reviews on these high volume days have rated this product an average of 2.9 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.

• 
• 80%
• Unverified Purchases

401 of the 504 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.2 while the verified purchasers 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.

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.

Brand Loyalists

• 
• 4%
• Reviewed mostly products from this brand

18 of the 504 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.

Brand Monogamists

• 
• 2%
• Reviewed only products from this brand

11 of the 504 reviewers have reviewed multiple products, but only for this brand. This is an excessively large percentage of Brand Monogamists which may indicate unnatural reviews.

Read more about our Brand Repeats test.

One-Hit Wonders

• 
• 11%
• have only posted one review

53 of the 504 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

• 
• 38%
• have zero verified purchases

194 of the 504 reviewers have never written a verified purchase review. While this is more Never-Verified Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Take-Back Reviewers

• 
• 3%
• have previously deleted reviews

17 of the 504 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

Single-Day Reviewers

• 
• 2%
• have posted all their reviews on a single day

10 of the 504 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 4.7 while all other reviewers 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 Suspicious Reviewers test.

• 
• 17%
• Substantial overlapping review history

87 of the 504 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 3.9 while the reviewers who have a more unique product review history rated this product an average of 3.3. 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.

Read more about our Overlapping Review History test.

• 9
• Reviews have been deleted

We discovered a total of 9 deleted Reviews for this product, with an average rating of 2.7. 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

• 
• 35%
• Used substantial repetitive phrases

178 of the 504 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

Read more about our Phrase Repetition 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.

• 
• 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.

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 3.7, while the average ease score for reviewers in this category is 3.9.

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.