Browser Extensions 

Solar Charger,Dizaul® 5000mAh Portable Solar Power Bank Waterproof/Shockproof/Dustproof Dual USB... From dizauL Report Feedback

Brigade Warning!:
Our algorithm has detected a large amount of suspicious negative reviews. Learn more about Review Brigades.
Fail Unnatural reviews detected

Original:

3,421 Reviews

Adjusted:

2,230 Reviews

Rank in: Solar Chargers
34%
31%

View/Edit Adjustment
How is this calculated
Report Last Updated: Apr 21, 2018
Advertisement (Support us to Hide Ads)

Report Card

Click a test to jump to details

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

Most Trusted Reviews

I may have received a dud, but this device does ... [Go to full review]
Apr 13, 2018      
100% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 4.8)


Least Trusted Reviews

Doesn't provide required capacity - when fully charged - it ... [Go to full review]
Apr 14, 2018      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Overrepresented word count (34 words)
  • One-Hit Wonder
  • Never-Verified Reviewer
  • Critical Reviewer (avg. rating: 2.0)


Analysis Details


Fail Deleted Reviews

We discovered a total of 936 deleted reviews 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.

5.0 average rating of deleted reviews

5.0



Read more about our Deleted Reviews test.

Fail Suspicious Reviewers

One-Hit Wonders


222 of the 3,421 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 2.2 while the reviewers who have posted more than one review have rated this product an average of 3.9. 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


2.2
3.9


Never-Verified Reviewers


50 of the 3,421 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 2.5 while the reviewers who have written at least one verified purchase review rated this product an average of 3.8. 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


2.5
3.8


Take-Back Reviewers


177 of the 3,421 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 4.0 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 3.8. 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


4.0
3.8


Read more about our Suspicious Reviewers test.

Fail Word Count Comparison

  • 22%
  • 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 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 760 reviews (or 22%) are within an overrepresented word count group. These reviews have rated this product an average of 4.0, while all other reviews have rated this product an average of 3.7. 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 reviews with an overrepresented word count

from reviews with a properly represented word count


4.0
3.7


Read more about our Word Count Comparison 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:
206 reviews
(6.0%)
102 reviews
(3.0%)
90 reviews
(2.6%)
130 reviews
(3.8%)
Show MoreShow Less
Common Phrases in Titles:
95 reviews
(2.8%)
62 reviews
(1.8%)


132 of the 3,421 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.6 while reviews without substantial repetitive phrases rated this product an average of 3.7. 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 reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.6
3.7


Read more about our Phrase Repetition test.

Fail Overlapping Review History
Does not include products
from the same brand


622 of the 3,421 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 5.0 while the reviewers who have a more unique product review history rated this product an average of 3.5. 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 reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


5.0
3.5


Read more about our Overlapping Review History test.

Fail Reviewer Participation

  • 43%
  • From reviewers with an overrepresented participation

We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 1454 reviewers (or 43%) are within an overrepresented participation group. These reviews have rated this product an average of 4.0, while all other reviews have rated this product an average of 3.6. 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 an overrepresented participation

From reviewers with a properly represented participation


4.0
3.6


Read more about our Reviewer Participation test.

Fail 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 found that the negative reviews had an average net helpfulness score of -3.3 while the positive reviews had an average net helpfulness score of 2.7. Based on our statistical modeling, this discrepancy is significant enough to believe that the difference is not due to random chance, but possibly due to influence of unnatural voting patterns.

Example critical reviews

2.7 average net helpfulness for positive reviews

-3.3 average net helpfulness for negative reviews


Read more about our Skewed Helpfulness test.


Warn Rating Trend

  • 28%
  • Created over 67 days

We counted 3,421 reviews for this product over the span of 991 days, an average of 3.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 11 or fewer reviews on any given day.

However, we see the following 67 days exceeding this threshold:In total, we found that 971 reviews were created on just 67 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


3.8
3.7


Read more about our Rating Trend test.

Pass Unverified Purchases

261 of the 3,421 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


3.1
3.8


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 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


217 of the 3,421 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


4.9
3.7


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.


13 of the 3,421 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


4.2
3.8


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.