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 4.3, while the average ease score for reviewers in this category is 4.2. 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.

• 
• 16%
• Created over 17 days

We counted 581 reviews for this product over the span of 2,688 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 17 days exceeding this threshold:

• 11 Reviews on Feb 12, 2013 (Avg. rating: 4.7)
• 11 Reviews on Jan 28, 2013 (Avg. rating: 4.4)
• 8 Reviews on Feb 6, 2013 (Avg. rating: 4.5)
• 6 Reviews on Feb 9, 2013 (Avg. rating: 4.8)
• 6 Reviews on Feb 18, 2013 (Avg. rating: 4.0)
• 5 Reviews on Jan 29, 2013 (Avg. rating: 5.0)
• 5 Reviews on May 22, 2014 (Avg. rating: 4.8)
• 5 Reviews on Feb 8, 2013 (Avg. rating: 4.6)
• 5 Reviews on Feb 3, 2013 (Avg. rating: 4.2)
• 4 Reviews on Jan 16, 2013 (Avg. rating: 5.0)
• 4 Reviews on Feb 13, 2013 (Avg. rating: 5.0)
• 4 Reviews on Mar 30, 2013 (Avg. rating: 5.0)
• 4 Reviews on Feb 26, 2013 (Avg. rating: 4.8)
• 4 Reviews on Jan 21, 2013 (Avg. rating: 4.5)
• 4 Reviews on May 29, 2014 (Avg. rating: 4.5)
• 4 Reviews on Feb 4, 2013 (Avg. rating: 4.3)
• 4 Reviews on Feb 10, 2013 (Avg. rating: 4.0)
Show All

In total, we found that 94 reviews were created on just 17 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

One-Hit Wonders

• 
• 12%
• have only posted one review

70 of the 581 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.

Take-Back Reviewers

• 
• 4%
• have previously deleted reviews

23 of the 581 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.

Read more about our Suspicious Reviewers test.

• 
• 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 2 groups with a statistically significant greater concentration than what we'd expect to see:

• 16-25 words: 19.1% (Avg. rating: 4.5)
• 26-40 words: 20.1% (Avg. rating: 4.7)

In total, we found that 228 reviews (or 39%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, the discrepancy in ratings between reviews with overrepresented word groups and all other reviews isn’t significant enough to rule out the possibility of it being due to random chance.

Read more about our Word Count Comparison test.

• 
• 92%
• 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: 34.8% (Avg. rating: 4.6)
• Reviewers with 6-15 Reviews: 57.3% (Avg. rating: 4.5)

In total, we found that 535 reviewers (or 92%) 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.

• 
• 15%
• Unverified Purchases

87 of the 581 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.

• 
• 12%
• Used substantial repetitive phrases

70 of the 581 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.

• 
• 16%
• Substantial overlapping review history

94 of the 581 reviewers have substantial overlapping product review history. 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 Overlapping Review History test.

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

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.