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Do No Harm (Stories of Life, Death, and Brain Surgery)
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From Henry Marsh
This report was last updated 4/12/2021.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.com claims 3,661 Ratings, we counted 702 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Pass Overall Grade
WARN Deleted Reviews
WARN Rating Trend
WARN Suspicious Reviewers
WARN Reviewer Participation
PASS Unverified Purchases
PASS Word Count Comparison
PASS Phrase Repetition
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
Most Trusted Reviews
Of you have medical terminology you might find this book ... [Go to full review]
Dec 8, 2018
100%
TRUST
TRUST
- Verified Purchaser
- Take-Back Reviewer (1 deleted Review; avg. rating: 1.0)
- Critical Reviewer (avg. rating: 3.9)
Least Trusted Reviews
Great book: interesting, informative. If you want to improve your ... [Go to full review]
May 28, 2015
32%
TRUST
TRUST
- Verified Purchaser
- Created on a high volume day
- Take-Back Reviewer (1 deleted Review; avg. rating: 4.0)
- Overrepresented Participation (posted 7 Reviews)
- Easy Grader (avg. rating: 4.4)
Analysis Details
Warn Deleted Reviews
We discovered a total of 12 deleted Reviews for this product, with an average rating of 4.7. 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:
- 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.
Warn Rating Trend
-
- 16%
- Created over 21 days
We counted 702 reviews for this product over the span of 2,513 days, an average of 0.3 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 21 days exceeding this threshold:In total, we found that 111 reviews were created on just 21 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Suspicious Reviewers
Take-Back Reviewers
225 of the 702 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.
Warn Reviewer Participation
-
- 73%
- From reviewers with an overrepresented participation
We see the following 3 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 509 reviewers (or 73%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Unverified Purchases
122 of the 702 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
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- 17%
- 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 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 118 reviews (or 17%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass 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
17 reviews
(4.3/5)
(4.3/5)
10 reviews
(4.3/5)
(4.3/5)
8 reviews
(4.8/5)
(4.8/5)
8 reviews
(5.0/5)
(5.0/5)
9 reviews
(4.3/5)
(4.3/5)
Common Phrases in Titles:
10 reviews
(4.8/5)
(4.8/5)
8 of the 702 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.
Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
5% also reviewed:
When Breath Becomes Air by Paul Kalanithi
5% also reviewed:
Being Mortal: Medicine and What Matters in the End by Atul Gawande
3% also reviewed:
All the Light We Cannot See: A Novel by Anthony Doerr
3% also reviewed:
Hillbilly Elegy: A Memoir of a Family and Culture... by J. D. Vance
3% also reviewed:
The Goldfinch by Donna Tartt
2% also reviewed:
Gone Girl: A Novel by Julia Whelan
2% also reviewed:
The Martian: Classroom Edition: A Novel by Andy Weir
2% also reviewed:
On the Move: A Life by Oliver Sacks
2% also reviewed:
Chapter Seven: Lost Boys by Joe Gonzalez
133 of the 702 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
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 4.3.
4.3 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
16 of the 702 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
1 of the 702 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. 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 Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.