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From Ed Miller
This report was last updated 9/11/2023.
Refresh the report to view the most up-to-date data available:
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Note: We only analyze "reviews" and ignore one-tap "ratings".
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Report Card
Pass Overall Grade
FAIL 
Phrase Repetition
Phrase RepetitionWARN Deleted Reviews
Deleted ReviewsWARN Brand Repeats
Brand RepeatsWARN Suspicious Reviewers
Suspicious ReviewersPASS Rating Trend
Rating TrendPASS Unverified Purchases
Unverified PurchasesPASS Word Count Comparison
Word Count ComparisonPASS Overlapping Review History
Overlapping Review HistoryPASS Reviewer Ease
Reviewer EasePASS Incentivized Reviews
Incentivized ReviewsN/A Reviewer Participation
Reviewer Participation
Most Trusted Reviews
I find some of the information interesting because I am ... [Go to full review]
Jan 21, 2021
100%
TRUST
TRUST
-
Unverified Purchaser
-
Critical Reviewer (avg. rating: 1.0)
Easy Grader (avg. rating: 4.8)
Take-Back Reviewer (1 deleted Review; avg. rating: 4.0)
Overlapping Review History: reviewed 1 of 9 top products
Least Trusted Reviews
A good book. Arrived in perfect condition in a timely ... [Go to full review]
Oct 21, 2019
5%
TRUST
TRUST
-
Verified Purchaser -
Contains repetitive phrases (show)
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Single-Day Reviewer (posted all reviews on Oct 21, 2019) -
Brand Loyalist (2 of 3 reviews for this brand; avg rating: 5.0) -
Critical Reviewer (avg. rating: 3.7)
Created on a high volume day
One-Hit Wonder
Overrepresented Participation (posted 7 Reviews)
Analysis Details
Fail Phrase Repetition
Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
Show MoreShow Less
~6% of reviews
(5.0/5)
(5.0/5)
~6% of reviews
(5.0/5)
(5.0/5)
~6% of reviews
(5.0/5)
(5.0/5)
~6% of reviews
(5.0/5)
(5.0/5)
~6% of reviews
(5.0/5)
(5.0/5)
~6% of reviews
(5.0/5)
(5.0/5)
Approximately 65% of reviews use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.7 while reviews without substantial repetitive phrases 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.
Warn Deleted Reviews
Deleted Reviews
We discovered a total of 1 deleted Review for this product, with an average rating of 5. 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:
- 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.
- We have no information on reviews that were never published in the first place.
- 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.
5.0 average rating of deleted reviews
Warn Brand Repeats
Brand Repeats
Brand Loyalists
Less than approximately 10% of 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, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.
Warn Suspicious Reviewers
Suspicious Reviewers
One-Hit Wonders
Approximately 25% of reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, the discrepancy in ratings between the One-Hit Wonders and reviewers who have posted more than one review isn't significant enough to rule out the possibility of it being due to random chance.
Pass Rating Trend
Rating Trend
We didn't notice any signals that would indicate reviews were created unevenly over time.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Pass Unverified Purchases
Unverified Purchases
15 of the 610 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.
Pass Word Count Comparison
Word Count Comparison
-
- <10%
- 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.
Read more about our Word Count Comparison test.
Pass Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
~40% also reviewed:
Dr. McDougall's Right Foods Vegan Split Pea... by Dr. McDougall's Right Foods
<10% also reviewed:
Dr. McDougall's Right Foods Stay Full... by Dr. McDougall's Right Foods
<10% also reviewed:
The Flaw of Averages: Why We Underestimate Risk... by Sam L. Savage
<10% also reviewed:
Statistics Hacks: Tips & Tools for Measuring the... by Bruce Frey
<10% also reviewed:
Mathletics: How Gamblers, Managers, and Sports... by Wayne L. Winston
<10% also reviewed:
Holmes True HEPA, Filter, White by HOLMES
<10% also reviewed:
The Signal and the Noise: Why So Many Predictions... by Nate Silver
<10% also reviewed:
Amazon Store Card by Synchrony Bank
<10% also reviewed:
Scotch Heavy Duty Shipping Packaging Tape, 2 x... by Scotch
Approximately 20% of 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.
Pass Reviewer Ease
Reviewer Ease
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.
4.2 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Incentivized Reviews
Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- <10%
- 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.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.