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American Gun: A History of the U.S. in Ten Firearms
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From Chris Kyle
This report was last updated 8/24/2017.
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Last Updated: Aug 24, 2017
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Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Pass Overall Grade
FAIL Reviewer Ease
WARN Rating Trend
WARN Suspicious Reviewers
WARN Word Count Comparison
WARN Reviewer Participation
PASS Unverified Purchases
PASS Phrase Repetition
PASS Overlapping Review History
PASS Brand Repeats
PASS Incentivized Reviews
PASS Deleted Reviews
Most Trusted Reviews
I didn't read American Sniper, for whatever reason. Perhaps I've ... [Go to full review]
Jul 31, 2014
100%
TRUST
TRUST
- Unverified Purchaser
- Take-Back Reviewer (8 deleted Reviews; avg. rating: 4.4)
- Overlapping Review History: reviewed 1 of 9 top products
- Critical Reviewer (avg. rating: 4.1)
Least Trusted Reviews
We couldn't find any low-quality reviewsAnalysis Details
Fail 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 4.5, while the average ease score for reviewers in this category is 4.3. 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.
4.5 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Warn Rating Trend
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- 13%
- Created over 20 days
We counted 919 reviews for this product over the span of 1,535 days, an average of 0.6 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.
However, we see the following 20 days exceeding this threshold:In total, we found that 117 reviews were created on just 20 days. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.
Warn Suspicious Reviewers
Take-Back Reviewers
54 of the 919 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 Word Count Comparison
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- 44%
- 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:In total, we found that 404 reviews (or 44%) 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.
Warn Reviewer Participation
-
- 66%
- From reviewers with an overrepresented participation
We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 606 reviewers (or 66%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Unverified Purchases
103 of the 919 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 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
20 reviews
23 reviews
13 reviews
12 reviews
17 reviews
23 reviews
9 reviews
10 reviews
8 reviews
18 reviews
Common Phrases in Titles:
23 reviews
18 reviews
15 reviews
58 of the 919 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:
4% also reviewed:
Killing Patton: The Strange Death of World War... by Bill O'Reilly
3% also reviewed:
Service: A Navy SEAL at War by Luttrell, Marcus/ Hornfischer, James D. (CON)
3% also reviewed:
Killing Kennedy: The End of Camelot by Bill O'Reilly
2% also reviewed:
Lone Survivor by Mark Wahlberg
Does not include products
from the same brand
from the same brand
191 of the 919 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 Brand Repeats
Brand Repeaters
9 of the 919 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 919 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.
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.