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Ei Electronics Ei650 Rauchmelder (mit 10-Jahres-Batterie, Testsieger Stiftung-Warentest, 1 Stück)
More product info From Ei Electronics

Amazon Reviews for  Ei Electronics Ei650 Rauchmelder (mit 10-Jahres-Batterie, Testsieger Stiftung-Warentest, 1 Stück)
Rating:
5,287 Ratings
2,800 Reviews
("Ratings" vs. "Reviews")
15% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
Jump to Report Card
Report Info:
Last Updated: Nov 6, 2020
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Show Report History
Note: While Amazon.de claims 5,287 Ratings, we counted 2,800 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

nach 5 Jahren Batterie alle, und nur alle viertel Jahr ... [Go to full review]
Jul 22, 2020      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (2 deleted Reviews; avg. rating: 3.5)
  • Critical Reviewer (avg. rating: 4.0)


Least Trusted Reviews

Die bestellten Rauchmelder wurden sehr schnell geliefert und waren sehr ... [Go to full review]
Jan 15, 2017      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Contains repetitive phrases (show)
  • One-Hit Wonder
  • Never-Verified Reviewer
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Rating Trend

  • 3%
  • Created over 12 days

We counted 2,800 reviews for this product over the span of 2,922 days, an average of 1.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 12 days exceeding this threshold:In total, we found that 78 reviews were created on just 12 days. The reviews on these high volume days have rated this product an average of 4.8 while reviews from other days have rated this product an average of 4.6. 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 created on high volume days

from reviews created on normal volume days


4.8
4.6


Read more about our Rating Trend test.

Fail Suspicious Reviewers

One-Hit Wonders


119 of the 2,800 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.8 while the reviewers who have posted more than one review have rated this product an average of 4.7. 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 one-hit wonders

from reviewers with more than one review


3.8
4.7


Never-Verified Reviewers


24 of the 2,800 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 3.4 while the reviewers who have written at least one verified purchase review rated this product an average of 4.6. 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 never-verified reviewers

from reviewers with at least one verified purchase review


3.4
4.6


Take-Back Reviewers


748 of the 2,800 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.8 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.6. 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 take-back reviewers

from reviewers without previously deleted reviews


4.8
4.6


Single-Day Reviewers


91 of the 2,800 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.8 while all other reviewers rated this product an average of 4.6. 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 single-day reviewers

from non-single-day reviewers


4.8
4.6


Read more about our Suspicious Reviewers 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:
57 reviews
(4.7/5)
49 reviews
(4.6/5)
151 reviews
(4.8/5)
88 reviews
(4.9/5)
77 reviews
(5.0/5)
56 reviews
(4.8/5)
52 reviews
(4.9/5)
82 reviews
(4.7/5)
62 reviews
(4.8/5)
43 reviews
(4.9/5)
Show MoreShow Less
Common Phrases in Titles:
30 reviews
(4.9/5)
51 reviews
(4.9/5)
44 reviews
(4.9/5)
34 reviews
(4.8/5)
29 reviews
(4.9/5)
20 reviews
(5.0/5)
76 reviews
(4.8/5)
Show MoreShow Less


449 of the 2,800 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.8 while reviews without substantial repetitive phrases rated this product an average of 4.6. 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


4.8
4.6


Read more about our Phrase Repetition test.

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

Does not include products
from the same brand


408 of the 2,800 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 4.6. 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
4.6


Read more about our Overlapping Review History test.

Warn Deleted Reviews

We discovered a total of 67 deleted Reviews for this product, with an average rating of 4.6. 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.

4.6 average rating of deleted reviews

4.6


Show distribution of deleted reviews

Warn 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 4.4, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

4.4 Product's Average Ease Score

4.2 Category's Average Ease Score


4.4
4.2


Read more about our Reviewer Ease test.


Pass Unverified Purchases

121 of the 2,800 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


4.1
4.6


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 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 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.