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EPAuto 300W Car Power Inverter DC 12V to 110V AC Converter with Dual USB Charger From EPAuto Report Feedback

Pass Reviews appear natural

Original:

231 Reviews

Adjusted:

206 Reviews

Rank in: Power Inverters
55%
58%

View/Edit Adjustment
How is this calculated
Report Last Updated: Jul 24, 2017
Update Available
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Report Card

Click a test to jump to details

FAIL Word Count Comparison
FAIL Overlapping Review History
WARN Suspicious Reviewers
WARN Reviewer Participation
PASS Rating Trend
PASS Unverified Purchases
PASS Phrase Repetition
PASS Reviewer Ease
PASS Brand Repeats
PASS Skewed Helpfulness
PASS Incentivized Reviews
PASS Deleted Reviews
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Most Trusted Reviews

It's fine, but it has some issues for me.Pros: The ... [Go to full review]
Jul 3, 2017      
100% TRUST
  • Verified Purchaser
  • Created on a high volume day
  • Critical Reviewer (avg. rating: 4.2)


Least Trusted Reviews

Great Job ! [Go to full review]
Jul 4, 2017      
40% TRUST
  • Verified Purchaser
  • Overrepresented word count (2 words)
  • Overlapping Review History: reviewed 1 of 9 top products
  • Easy Grader (avg. rating: 5.0)


Analysis Details


Fail Word Count Comparison

  • 25%
  • 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 58 reviews (or 25%) are within an overrepresented word count group. These reviews have rated this product an average of 4.8, while all other reviews have rated this product an average of 4.1. 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


4.8
4.1


Read more about our Word Count Comparison test.

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


19 of the 231 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 4.2. 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 reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.8
4.2


Read more about our Overlapping Review History test.

Warn Suspicious Reviewers

Take-Back Reviewers


16 of the 231 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, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.

from take-back reviewers

from reviewers without previously deleted reviews


4.6
4.3


Read more about our Suspicious Reviewers test.

Warn Reviewer Participation

  • 40%
  • 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 92 reviewers (or 40%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.0
4.4


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 4%
  • Created over 2 days

We counted 231 reviews for this product over the span of 379 days, an average of 0.6 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 10 reviews were created on just 2 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews created on high volume days

from reviews created on normal volume days


4.3
4.3


Read more about our Rating Trend test.

Pass Unverified Purchases

4 of the 231 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


4.0
4.3


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:
4 reviews
(1.7%)
3 reviews
(1.3%)
2 reviews
(0.9%)
Common Phrases in Titles:
3 reviews
(1.3%)
2 reviews
(0.9%)


7 of the 231 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


4.6
4.3


Read more about our Phrase Repetition 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 4.3.

4.2 Product's Average Ease Score

4.3 Category's Average Ease Score


4.2
4.3


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters


3 of the 231 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


5.0
4.3


Read more about our Brand Repeats 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.

0.0 average net helpfulness for positive reviews

0.0 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.

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

Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.
Read more about our Deleted Reviews test.


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