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Yumi Beautiful - Vitamin C Serum
More product info
From Yumi Beautiful
This report was last updated 5/11/2017.
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Report Info:
Last Updated: May 11, 2017
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Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Neck & Décolleté with authentic reviews:
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Fail Overall Grade
FAIL 
Deleted Reviews
Deleted ReviewsFAIL Unverified Purchases
Unverified PurchasesFAIL Suspicious Reviewers
Suspicious ReviewersFAIL Reviewer Ease
Reviewer EaseFAIL Word Count Comparison
Word Count ComparisonFAIL Phrase Repetition
Phrase RepetitionFAIL Overlapping Review History
Overlapping Review HistoryWARN Rating Trend
Rating TrendWARN Reviewer Participation
Reviewer ParticipationPASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized Reviews
Most Trusted Reviews
We couldn't find any quality reviews
Least Trusted Reviews
Great product! Weird consistency kind of liquidy but dries quickly ... [Go to full review]
Feb 8, 2015
0%
TRUST
TRUST
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Unverified Purchaser -
Created on a high volume day -
Overrepresented word count (15 words)
-
Never-Verified Reviewer -
Take-Back Reviewer (1 deleted Review; avg. rating: 5.0) -
Overlapping Review History: reviewed 1 of 9 top products -
Overrepresented Participation (posted 8 Reviews) -
Easy Grader (avg. rating: 4.8)
show)
Analysis Details
Fail Deleted Reviews
Deleted Reviews
We discovered a total of 122 deleted Reviews for this product, with an average rating of 4.7. 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:
- 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.
- We have no information on reviews that were never published in the first place.
- 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.
4.7 average rating of deleted reviews
Fail Unverified Purchases
Unverified Purchases
582 of the 617 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.7 while the verified purchasers have rated this product an average of 4.0. 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.
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.
Fail Suspicious Reviewers
Suspicious Reviewers
Never-Verified Reviewers
149 of the 617 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.
Take-Back Reviewers
192 of the 617 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 4.6. 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.
Fail Reviewer Ease
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 4.6, while the average ease score for reviewers in this category is 4.3. 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.
4.6 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Fail Word Count Comparison
Word Count Comparison
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- 50%
- 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 311 reviews (or 50%) are within an overrepresented word count group. These reviews have rated this product an average of 4.7, while all other reviews 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.
Fail Phrase Repetition
Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
28 of the 617 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.9 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.
Fail Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
6% also reviewed:
Luxury 10 Piece Makeup Brush Set in Boutique GIFT... by Queen B Brushes
6% also reviewed:
Hyaluronic Acid Plus Serum with Vitamin C Serum... by Yeouth
6% also reviewed:
Crave Naturals Eyelash Comb Four in One Set by Crave Naturals
5% also reviewed:
InstaNatural Vitamin C Serum with Hyaluronic Acid... by InstaNatural
5% also reviewed:
Chef Caron Non Stick BBQ Grill mats - Set of 2 -... by Chef Caron
5% also reviewed:
Chef's Ware Digital Thermometer - Instant Read... by Chef's Ware
5% also reviewed:
Microbiome Plus Gastrointestinal Probiotics L... by Microbiome Plus
5% also reviewed:
Natizo Stainless Steel Measuring Spoon Set -... by Natizo
Does not include products
from the same brand
from the same brand
184 of the 617 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 4.6. 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.
Warn Rating Trend
Rating Trend
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- 46%
- Created over 37 days
We counted 617 reviews for this product over the span of 687 days, an average of 0.9 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 37 days exceeding this threshold:In total, we found that 285 reviews were created on just 37 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Reviewer Participation
Reviewer Participation
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- 51%
- 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 315 reviewers (or 51%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
46 of the 617 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.
Pass Incentivized Reviews
Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
9 of the 617 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.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.