Browser Extensions 

AmazonBasics Performance Alkaline Batteries From AmazonBasics Report Feedback

Warn Unnatural reviews possible

Original:

15,189 Reviews

Adjusted:

10,906 Reviews

Rank in: AA
63%
67%

View/Edit Adjustment
How is this calculated
Last Updated: Aug 28, 2017
Update Available
Advertisement (Support us to Hide Ads)

Report Card

Click a test to jump to details

FAIL Suspicious Reviewers
FAIL Word Count Comparison
FAIL Overlapping Review History
WARN Deleted Reviews
WARN Rating Trend
WARN Brand Repeats
PASS Unverified Purchases
PASS Phrase Repetition
PASS Reviewer Participation
PASS Reviewer Ease
PASS Skewed Helpfulness
PASS Incentivized Reviews
Advertisement (Support us to Hide Ads)

Most Trusted Reviews

Oct 13, 2015      
70% TRUST
  • Verified Purchaser
  • Overrepresented word count (1 word)
  • Take-Back Reviewer (2 deleted reviews; avg. rating: 5.0)
  • Brand Repeater (2 of 369 reviews for this brand; avg rating: 5.0)
  • Easy Grader (avg. rating: 4.5)


Least Trusted Reviews

Great product [Go to full review]
Dec 2, 2016      
0% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Overrepresented word count (2 words)
  • One-Hit Wonder
  • Take-Back Reviewer (1 deleted review; avg. rating: 5.0)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Note: While Amazon claims 15,189 reviews, we counted 15,190 available on their site.

Fail Suspicious Reviewers

One-Hit Wonders


172 of the 15,190 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.2 while the reviewers who have posted more than one review have rated this product an average of 4.5. 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


3.2
4.5


Take-Back Reviewers


3,324 of the 15,190 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 4.7 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.4. 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 take-back reviewers

from reviewers without previously deleted reviews


4.7
4.4


Read more about our Suspicious Reviewers test.

Fail Word Count Comparison

  • 64%
  • 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 9,769 reviews (or 64%) are within an overrepresented word count group. These reviews have rated this product an average of 4.6, while all other reviews have 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.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.6
4.2


Read more about our Word Count Comparison test.

Fail Overlapping Review History

4% also reviewed:
Amazon Fire TV Stick by

3% also reviewed:
Fire by Amazon

Does not include products
from the same brand


2,611 of the 15,190 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.7 while the reviewers who have a more unique product review history rated this product an average of 4.4. 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


4.7
4.4


Read more about our Overlapping Review History test.

Warn Deleted Reviews

We discovered a total of 188 deleted reviews for this product, with an average rating of 4.8. 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.

4.8 average rating of deleted reviews

4.8



Read more about our Deleted Reviews test.

Warn Rating Trend

  • 9%
  • Created over 39 days

We counted 15,190 reviews for this product over the span of 983 days, an average of 15.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 30 or fewer reviews on any given day.

However, we see the following 39 days exceeding this threshold:In total, we found that 1,369 reviews were created on just 39 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.

from reviews created on high volume days

from reviews created on normal volume days


4.5
4.5


Read more about our Rating Trend test.

Warn Brand Repeats

Brand Repeaters


4,322 of the 15,190 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, the discrepancy in ratings between the Brand Repeaters and non-repeaters isn't significant enough to rule out the possibility of it being due to random chance.

from Brand Repeaters

from Non-Repeaters


4.7
4.4


Read more about our Brand Repeats test.

Pass Unverified Purchases

864 of the 15,190 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


4.4
4.5


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.

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:
469 reviews
(3.1%)
273 reviews
(1.8%)
356 reviews
(2.3%)
229 reviews
(1.5%)
169 reviews
(1.1%)
520 reviews
(3.4%)
Show MoreShow Less
Common Phrases in Titles:
219 reviews
(1.4%)


822 of the 15,190 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.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.4
4.5


Read more about our Phrase Repetition 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 4.4, while the average ease score for reviewers in this category is 4.3. 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

4.3 Category's Average Ease Score


4.4
4.3


Read more about our Reviewer Ease test.


Pass Skewed Helpfulness
We examined the average net helpfulness score of negative reviews against the average net helpfulness score of positive reviews. The net helpfulness score is the number of times a review has been marked as helpful minus the number of times a review has been marked as unhelpful. We could not find any statistically significant difference in average net helpfulness score between the negative reviews and positive reviews.

0.2 average net helpfulness for positive reviews

2.2 average net helpfulness for negative reviews


Read more about our Skewed Helpfulness 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.


5 of the 15,190 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.

from incentivized reviews

from non-incentivized reviews


4.4
4.5


Read more about our Incentivized Reviews test, or check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.