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Amazon.com > Health & Household > Vitamins, Minerals & Supplements > Herbal Supplements > Fruit Extracts > Elderberry
Quantum Health Elderberry Liquid Extract from Sambucus Nigra, Immune Defense, Dietary Supplement to...
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From Quantum
This report was last updated 3/18/2020.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Elderberry with authentic reviews:
Report Card
Pass Overall Grade
FAIL 
Reviewer Participation
Reviewer ParticipationWARN Rating Trend
Rating TrendWARN Suspicious Reviewers
Suspicious ReviewersPASS Unverified Purchases
Unverified PurchasesPASS Word Count Comparison
Word Count ComparisonPASS Phrase Repetition
Phrase RepetitionPASS Overlapping Review History
Overlapping Review HistoryPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized ReviewsPASS Deleted Reviews
Deleted Reviews
Most Trusted Reviews
I always have these bottles on hand... the first sign ... [Go to full review]
Feb 28, 2015 1 of 1 found this helpful.
100%
TRUST
TRUST
-
Verified Purchaser
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Take-Back Reviewer (12 deleted Reviews; avg. rating: 4.9) -
Overlapping Review History: reviewed 4 of 9 top products -
Easy Grader (avg. rating: 4.7)
show)
Least Trusted Reviews
This product is the best for avoiding viruses or shortening ... [Go to full review]
Dec 6, 2018
43%
TRUST
TRUST
-
Verified Purchaser
-
Created on a high volume day
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Overrepresented Participation (posted 11 Reviews) -
Critical Reviewer (avg. rating: 4.2)
Analysis Details
Fail Reviewer Participation
Reviewer Participation
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- 56%
- From reviewers with an overrepresented participation
We see the following 2 participation groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 37 reviewers (or 56%) 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 4.8. 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.
Warn Rating Trend
Rating Trend
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- 12%
- Created over 4 days
We counted 66 reviews for this product over the span of 2,937 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 1 or fewer reviews on any given day.
However, we see the following 4 days exceeding this threshold:In total, we found that 8 reviews were created on just 4 days. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.
Warn Suspicious Reviewers
Suspicious Reviewers
Take-Back Reviewers
25 of the 66 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.
Pass Unverified Purchases
Unverified Purchases
7 of the 66 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.
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
Word Count Comparison
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- 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.
Read more about our Word Count Comparison test.
Pass Phrase Repetition
Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
6 of the 66 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.
Pass Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
5% also reviewed:
Nature's Way DIM-Plus - Estrogen Metabolism... by Nature's Way
5% also reviewed:
Forensic Files - The Best of Season Nine by FilmRise
5% also reviewed:
Bambo Nature Baby Diapers Classic, Size, Count by Bambo Nature
3% also reviewed:
Up the Organization: How to Stop the Corporation... by Robert C. Townsend
3% also reviewed:
A Game of Thrones: A Song of Ice and Fire, Book 1 by George R. R. Martin
3% also reviewed:
Bush's Best Baked Beans, Vegetarian, 16 Oz by Bush's
3% also reviewed:
Uncle Harry's Peppermint Remineralizing... by Uncle Harry's
Does not include products
from the same brand
from the same brand
9 of the 66 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass 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 4.2, 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
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
We didn't detect a substantial amount of Brand Repeaters.
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.
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- 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.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Pass Deleted Reviews
Deleted Reviews
- 0
- Reviews have been deleted
We have not discovered any deleted reviews for this product.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
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.