One-Hit Wonders

• 
• 36%
• have only posted one review

77 of the 216 reviewers have only reviewed this product. This is an excessively large percentage of One-Hit Wonders which may indicate unnatural reviews.

Read more about our Suspicious Reviewers test.

• 
• 7%
• Created over 5 days

We counted 216 reviews for this product over the span of 2,950 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 5 days exceeding this threshold:

• 4 Reviews on Jan 9, 2017 (Avg. rating: 4.0)
• 3 Reviews on Nov 23, 2016 (Avg. rating: 4.7)
• 3 Reviews on Dec 11, 2016 (Avg. rating: 4.7)
• 3 Reviews on Sep 30, 2016 (Avg. rating: 4.3)
• 3 Reviews on Nov 25, 2016 (Avg. rating: 4.0)

In total, we found that 16 reviews were created on just 5 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Rating Trend 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 4.4, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

• 
• 82%
• 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 3 groups with a statistically significant greater concentration than what we'd expect to see:

• 16-25 words: 26.9% (Avg. rating: 4.7)
• 26-40 words: 32.4% (Avg. rating: 4.5)
• 41-65 words: 22.7% (Avg. rating: 4.4)

In total, we found that 177 reviews (or 82%) 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.

• 
• 74%
• 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: 73.6% (Avg. rating: 4.5)

In total, we found that 159 reviewers (or 74%) 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.

• 
• 2%
• Unverified Purchases

4 of the 216 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.

• 
• 0%
• Substantial overlapping review history

0 of the 216 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 Monogamists

• 
• 1%
• Reviewed only products from this brand

2 of the 216 reviewers have reviewed multiple products, but only for this brand. 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 Brand Repeats test.

• 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.

We have not yet completed optimization for this test for Hanzi or Kanji.

We have not yet completed optimization for this test for Hanzi or Kanji.