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Inferno
More product info From Dan Brown

Inferno View product on Amazon.com
Amazon Reviews for Inferno
Rating:
29,579 Ratings
21,203 Reviews
("Ratings" vs. "Reviews")
2% of potentially unnatural reviews removed (why?)
Adjusted:
20,858 Reviews



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Last Updated: Sep 22, 2020
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Note: While Amazon.com claims 29,579 Ratings, we counted 21,203 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

Pass Overall Grade
FAIL Phrase Repetition
WARN Deleted Reviews
WARN Rating Trend
WARN Suspicious Reviewers
PASS Unverified Purchases
PASS Word Count Comparison
PASS Overlapping Review History
PASS Reviewer Participation
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews

Most Trusted Reviews

5/5
I have yet to find a Dan Brown book I don't like!
I have yet to find a Dan Brown book I ... [Go to full review]
Jul 21, 2015      
59% TRUST
  • Verified Purchaser
  • Contains repetitive phrases (show)
  • Take-Back Reviewer (10 deleted Reviews; avg. rating: 3.7)
  • Easy Grader (avg. rating: 4.3)

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Least Trusted Reviews

5/5
Easy, quick, fun read for relaxatio
Really enjoyed this read as I have all other Dan ... [Go to full review]
Jul 9, 2015      
18% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Contains repetitive phrases (show)
  • Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
  • Easy Grader (avg. rating: 4.6)

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Report inaccurate data

Analysis Details

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:
dan brown book

826 reviews
(3.8/5)
dan brown's books

294 reviews
(3.9/5)
da vinci code

966 reviews
(3.4/5)
of dan brown's

367 reviews
(3.9/5)
twists and turns

1055 reviews
(4.4/5)
dan brown novel

456 reviews
(3.9/5)
typical dan brown

291 reviews
(4.0/5)
angels and demons

789 reviews
(3.6/5)
by dan brown

509 reviews
(4.3/5)
his other books

443 reviews
(3.5/5)
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Common Phrases in Titles:
by dan brow

280 reviews
(4.4/5)
dan brown does

161 reviews
(4.8/5)
by dan brown

179 reviews
(4.4/5)


3,544 of the 21,203 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.2 while reviews without substantial repetitive phrases rated this product an average of 4.0. 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.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.2
4.0

Read more about our Phrase Repetition test.

Warn Deleted Reviews

We discovered a total of 243 deleted Reviews for this product, with an average rating of 4.1. 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:
  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.

4.1 average rating of deleted reviews

4.1

Show distribution of deleted reviews

Warn Rating Trend

  • 65%
  • Created over 282 days

We counted 21,203 reviews for this product over the span of 2,827 days, an average of 7.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 18 or fewer reviews on any given day.

However, we see the following 282 days exceeding this threshold:In total, we found that 13,683 reviews were created on just 282 days. This is an excessively high number of reviews submitted on these high volume days.

from reviews created on high volume days

from reviews created on normal volume days


3.9
4.1

Read more about our Rating Trend test.

Warn Suspicious Reviewers

Take-Back Reviewers


5,510 of the 21,203 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.

from take-back reviewers

from reviewers without previously deleted reviews


4.0
4.0

Read more about our Suspicious Reviewers test.

Pass Unverified Purchases

3,251 of the 21,203 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.

from unverified purchasers

from verified purchases


3.7
4.1

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

  • 0%
  • 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.

Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:


3% also reviewed:
The Hunger Games (Hunger Games Trilogy, Book 1) by Suzanne Collins


3% also reviewed:
Gone Girl: A Novel by Julia Whelan


2% also reviewed:
Sycamore Row by John Grisham


2% also reviewed:
Insurgent: Divergent, Book 2 by Veronica Roth


2% also reviewed:
The Goldfinch by Donna Tartt


2% also reviewed:
The Cuckoo's Calling (Cormoran Strike) by Robert Galbraith


2% also reviewed:
Fifty Shades of Grey by JAMES E L


2% also reviewed:
Nose Vents Air Purifier Filter Stop Snore - Anti... by XIANGXIHUI


2% also reviewed:
Gray Mountain: A Novel by John Grisham

Show More Show Less
Does not include products
from the same brand


2,914 of the 21,203 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.0
4.0

Read more about our Overlapping Review History test.

Pass Reviewer Participation

  • 0%
  • From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.

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 4.2.

4.2 Product's Average Ease Score

4.2 Category's Average Ease Score


4.2
4.2

Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters


1,527 of the 21,203 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.

from Brand Repeaters

from Non-Repeaters


4.2
4.0

Read more about our Brand Repeats test.

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.

  • 0%
  • 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.