• 402
• Reviews have been deleted

We discovered a total of 402 deleted Reviews for this product, with an average rating of 4. 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

Take-Back Reviewers

• 
• 79%
• have previously deleted reviews

79 of the 100 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.

• 
• 37%
• Created over 10 days

We counted 100 reviews for this product over the span of 1,299 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.

However, we see the following 10 days exceeding this threshold:

• 7 Reviews on Feb 16, 2012 (Avg. rating: 4.3)
• 5 Reviews on Feb 22, 2012 (Avg. rating: 3.0)
• 4 Reviews on Feb 23, 2012 (Avg. rating: 4.5)
• 3 Reviews on Feb 21, 2012 (Avg. rating: 5.0)
• 3 Reviews on May 17, 2012 (Avg. rating: 4.7)
• 3 Reviews on Feb 17, 2012 (Avg. rating: 4.3)
• 3 Reviews on Feb 19, 2012 (Avg. rating: 4.3)
• 3 Reviews on Feb 20, 2012 (Avg. rating: 4.3)
• 3 Reviews on Mar 15, 2012 (Avg. rating: 4.3)
• 3 Reviews on Feb 27, 2012 (Avg. rating: 4.0)
Show All

In total, we found that 37 reviews were created on just 10 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 40%
• 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:

• 66-100 words: 19.0% (Avg. rating: 3.9)
• 101-200 words: 21.0% (Avg. rating: 4.1)

In total, we found that 40 reviews (or 40%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Word Count Comparison test.

• 
• 78%
• Used substantial repetitive phrases

78 of the 100 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.

• 
• 6%
• Unverified Purchases

6 of the 100 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.

• 
• 48%
• Substantial overlapping review history

48 of the 100 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.

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

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.