L-Tryptophan 500mg - 180 Kapseln hochdosiert - natürlich fermentiert - laborgeprüft - vegan -...
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Report Card
Most Trusted Reviews
TRUST
- Verified Purchaser
- Critical Reviewer (avg. rating: 1.3)
Least Trusted Reviews
TRUST
- Verified Purchaser
- Contains repetitive phrases (show)
- Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
- Overlapping Review History: reviewed 2 of 9 top products
- Easy Grader (avg. rating: 4.9)
Analysis Details
We discovered a total of 163 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.
One-Hit Wonders
Less than approximately 10% of reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.
Take-Back Reviewers
Approximately 35% of 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 1.3 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 0.5. 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.
Single-Day Reviewers
Less than approximately 10% of reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 0.0 while all other reviewers rated this product an average of 0.8. 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.
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- >90%
- 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 over approximately 90% are within an overrepresented word count group. These reviews have rated this product an average of 0.0, while all other reviews 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.
(4.0/5)
(4.0/5)
Less than approximately 10% of reviews use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.0 while reviews without substantial repetitive phrases rated this product an average of 0.6. 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.
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- <10%
- Created on high-volume days
Read more about our Rating Trend test.
16 of the 1,538 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.
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Approximately 20% of 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.
3.1 Product's Average Ease Score
3.9 Category's Average Ease Score
Read more about our Reviewer Ease test.
Brand Repeaters
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- <10%
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.