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Sports Research Stability Ball (Black, 75cm)
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From Sports Research
This report was last updated 8/6/2019.
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 Card
Warn Overall Grade
FAIL Deleted Reviews
FAIL Rating Trend
FAIL Unverified Purchases
FAIL Incentivized Reviews
FAIL Suspicious Reviewers
WARN Reviewer Ease
WARN Phrase Repetition
PASS Word Count Comparison
PASS Overlapping Review History
PASS Reviewer Participation
PASS Brand Repeats
Most Trusted Reviews
Slowly leaks. I have had to pump it every week ... [Go to full review]
Jul 13, 2017
100%
TRUST
TRUST
- Verified Purchaser
- Critical Reviewer (avg. rating: 2.6)
Least Trusted Reviews
I recently purchased Exercise Stability Ball with Bonus Hand Pump. ... [Go to full review]
May 1, 2016
0%
TRUST
TRUST
- Unverified Purchaser
- Created on a high volume day
- Admitted to receiving an incentive
- Contains repetitive phrases (show)
- Take-Back Reviewer (126 deleted Reviews; avg. rating: 5.0)
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Deleted Reviews
We discovered a total of 106 deleted Reviews for this product, with an average rating of 4.8. 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.
Fail Rating Trend
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- 25%
- Created over 5 days
We counted 87 reviews for this product over the span of 811 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.
However, we see the following 5 days exceeding this threshold:In total, we found that 22 reviews were created on just 5 days. The reviews on these high volume days have rated this product an average of 4.8 while reviews from other days have rated this product an average of 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.
Fail Unverified Purchases
48 of the 87 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 4.1. 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.
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 Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
29 of the 87 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. Incentivized reviews have rated this product an average of 4.7 while reviews that were not incentivized 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.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Fail Suspicious Reviewers
Take-Back Reviewers
63 of the 87 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.
Warn 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 4.4, while the average ease score for reviewers in this category is 4.5. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.
4.4 Product's Average Ease Score
4.5 Category's Average Ease Score
Read more about our Reviewer Ease test.
Warn 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:
Show MoreShow Less
3 reviews
(5.0/5)
(5.0/5)
3 reviews
(5.0/5)
(5.0/5)
7 reviews
(4.7/5)
(4.7/5)
3 reviews
(4.7/5)
(4.7/5)
7 reviews
(4.9/5)
(4.9/5)
2 reviews
(5.0/5)
(5.0/5)
2 reviews
(5.0/5)
(5.0/5)
4 reviews
(5.0/5)
(5.0/5)
2 reviews
(4.5/5)
(4.5/5)
3 reviews
(5.0/5)
(5.0/5)
27 of the 87 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
Pass Word Count Comparison
-
- 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 Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
3% also reviewed:
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3% also reviewed:
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2% also reviewed:
Stainless Steel Fish Spatula, Professional... by Lifestyle Dynamics
2% also reviewed:
Grill Tongs - 20% Thicker Stainless Steel... by Cave Tools
2% also reviewed:
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2% also reviewed:
PoshWag 20 Rolls Dog Poop Bag with Dispenser and... by PoshWag
Does not include products
from the same brand
from the same brand
17 of the 87 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 Participation
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- 0%
- From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.
Read more about our Reviewer Participation test.
Pass Brand Repeats
Brand Repeaters
3 of the 87 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.