Herbal Essences Bio Renew Birch Bark Extract Sulfate-free Shampoo, 360ml
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From Herbal Essences
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Most Trusted Reviews
TRUST
- Verified Purchaser
- Take-Back Reviewer (160 deleted Reviews; avg. rating: 4.1)
- Overlapping Review History: reviewed 9 of 9 top products
- Critical Reviewer (avg. rating: 3.8)
Least Trusted Reviews
TRUST
- Verified Purchaser
- Created on a high volume day
- Take-Back Reviewer (160 deleted Reviews; avg. rating: 4.1)
- Overlapping Review History: reviewed 9 of 9 top products
- Critical Reviewer (avg. rating: 3.8)
Analysis Details
8 of the 228 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.4 while the verified purchasers have 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.
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.
Take-Back Reviewers
142 of the 228 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.
(4.1/5)
(4.1/5)
(4.3/5)
(4.0/5)
99 of the 228 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.3 while reviews without substantial repetitive phrases 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.
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- 21%
- Created over 9 days
We counted 228 reviews for this product over the span of 990 days, an average of 0.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 3 or fewer reviews on any given day.
However, we see the following 9 days exceeding this threshold:In total, we found that 49 reviews were created on just 9 days. This is an excessively high number of reviews submitted on these high volume days.
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- 49%
- 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 111 reviews (or 49%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.
49% also reviewed:
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35% also reviewed:
Aromatherapy Essential Oil Diffusers - Ultrasonic... by Viva Naturals
28% also reviewed:
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26% also reviewed:
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from the same brand
170 of the 228 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, it does not appear to have a significant impact on the overall rating.
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- 19%
- 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 43 reviewers (or 19%) are within an overrepresented participation group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
4.3 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Brand Repeaters
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- 0%
- 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.
- 0
- Reviews have been deleted
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.