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Project Hail Mary: A Novel
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From Andy Weir
This report was last updated 7/6/2022.
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: We only analyze "reviews" and ignore one-tap "ratings".
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Report Card
Fail Overall Grade
FAIL Unverified Purchases
FAIL Phrase Repetition
WARN Rating Trend
WARN Incentivized Reviews
WARN Suspicious Reviewers
PASS Word Count Comparison
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
PASS Deleted Reviews
N/A Reviewer Participation
Most Trusted Reviews
When you try to compare every book to Stephen King, ... [Go to full review]
Jun 29, 2022
100%
TRUST
TRUST
- Verified Purchaser
- Critical Reviewer (avg. rating: 4.0)
Least Trusted Reviews
An alien life form is causing the sun to get ... [Go to full review]
May 4, 2021
0%
TRUST
TRUST
- Unverified Purchaser
- Created on a high volume day
- Admitted to receiving an incentive
- Contains repetitive phrases (show)
- Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
- Critical Reviewer (avg. rating: 4.3)
Analysis Details
Fail Unverified Purchases
1,515 of the 77,070 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.6 while the verified purchasers have rated this product an average of 4.1. 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.
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.
Fail 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
~3% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(5.0/5)
(5.0/5)
~4% of reviews
(4.0/5)
(4.0/5)
~4% of reviews
(5.0/5)
(5.0/5)
~4% of reviews
(4.7/5)
(4.7/5)
~3% of reviews
(4.0/5)
(4.0/5)
~3% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(5.0/5)
(5.0/5)
~5% of reviews
(4.8/5)
(4.8/5)
Common Phrases in Titles:
~3% of reviews
(5.0/5)
(5.0/5)
~3% of reviews
(4.5/5)
(4.5/5)
Approximately 35% of reviews use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.6 while reviews without substantial repetitive phrases rated this product an average of 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.
Warn Rating Trend
It appears that several reviews were created during just a short period of time.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Warn Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
Less than approximately 10% of reviews admitted to receiving a free or discounted product in exchange for a review. While we could not find a statistically significant difference between the average rating of incentivized reviews and non-incentivized reviews, the presences of at least one incentivized review indicates that there may be more, since not all reviewers will disclose that they had received an incentive to post a 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.
Warn Suspicious Reviewers
Take-Back Reviewers
Approximately 25% of 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.
Pass 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
Reviewers of this product have ALSO reviewed the following products:
<10% also reviewed:
Storm Front by Jim Butcher
<10% also reviewed:
Killers of the Flower Moon: Oil, Money, Murder... by SIMON SCHUSTER
<10% also reviewed:
We Are Legion (We Are Bob) (Bobiverse) (Volume 1) by Dennis E. Taylor
<10% also reviewed:
Leviathan Wakes (The Expanse, 1) by
<10% also reviewed:
Old Man's War: Book 1 by John Scalzi
<10% also reviewed:
Symphonized GLXY Premium Genuine Wood in-Ear... by Symphonized
<10% also reviewed:
Victor Allen's Coffee Sweet and Salty... by Victor Allen
Does not include products
from the same brand
from the same brand
Approximately 15% 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
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 Brand Repeats
Brand Repeaters
Less than approximately 10% of 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 Deleted Reviews
- 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:
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.