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Die Blockchain-Revolution: Wie die Technologie hinter Bitcoin nicht nur das Finanzsystem, sondern...
More product info From Don Tapscott

Brigade Warning!:
Our algorithm has detected a large amount of suspicious negative reviews. Learn more about Review Brigades.
Amazon Reviews for  Die Blockchain-Revolution: Wie die Technologie hinter Bitcoin nicht nur das Finanzsystem, sondern die ganze Welt verändert
Rating:
21 Ratings
21 Reviews
("Ratings" vs. "Reviews")
43% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
Jump to Report Card

Report Card

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

Most Trusted Reviews

5/5
Nov 15, 2018      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (1 deleted Review; avg. rating: 3.0)
  • Critical Reviewer (avg. rating: 3.6)


Least Trusted Reviews

Das Buch öffnet Augen. Es geht nicht nur um das, ... [Go to full review]
Aug 21, 2017      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Overlapping Review History: reviewed 1 of 9 top products
  • Easy Grader (avg. rating: 4.3)


Analysis Details

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



5 of the 21 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.8 while the reviewers who have a more unique product review history rated this product an average of 2.4. 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 reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.8
2.4


Read more about our Overlapping Review History test.

Warn 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:
  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.

5.0 average rating of deleted reviews

5.0


Show distribution of deleted reviews

Warn Rating Trend

  • 10%
  • Created over 1 day

We counted 21 reviews for this product over the span of 799 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 1 or fewer reviews on any given day.

However, we see the following 1 day exceeding this threshold:In total, we found that 2 reviews were created on just 1 day. 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.

from reviews created on high volume days

from reviews created on normal volume days


4.5
2.8


Read more about our Rating Trend test.

Warn Unverified Purchases

11 of the 21 total reviews for this product are unverified purchases. While this is a higher percentage of unverified purchases than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from unverified purchasers

from verified purchases


2.6
3.5


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.

Warn Suspicious Reviewers

One-Hit Wonders


3 of the 21 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from one-hit wonders

from reviewers with more than one review


2.3
3.1


Never-Verified Reviewers


6 of the 21 reviewers have never written a verified purchase review. While this is more Never-Verified Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from never-verified reviewers

from reviewers with at least one verified purchase review


2.5
3.2


Read more about our Suspicious Reviewers test.

Warn 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:
3 reviews
(2.7/5)
2 reviews
(3.0/5)
2 reviews
(5.0/5)
2 reviews
(5.0/5)
2 reviews
(1.0/5)
3 reviews
(2.7/5)
2 reviews
(3.0/5)
Show MoreShow Less


4 of the 21 total reviews for this product use substantial repetitive phrases between them. While this is more than we'd expect to see, the discrepancy in ratings between the these reviews and reviews without substantial repetitive phrases isn't significant enough to rule out the possibility of it being due to random chance.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.0
2.8


Read more about our Phrase Repetition 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 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 3.4, while the average ease score for reviewers in this category is 3.9.

3.4 Product's Average Ease Score

3.9 Category's Average Ease Score


3.4
3.9


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

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.