Close
Kirkland Signature Nighttime Sleep Aid 25mg - 96 Tablets
More product info
From Kirkland Signature
This report was last updated 1/21/2019.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
View/Edit Adjustment
Jump to Report Card
Report Info:
Note: While Amazon.com claims 355 Ratings, we counted 288 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Warn Overall Grade
FAIL Deleted Reviews
FAIL Suspicious Reviewers
WARN Word Count Comparison
WARN Reviewer Participation
PASS Rating Trend
PASS Unverified Purchases
PASS Phrase Repetition
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
Most Trusted Reviews
This product really works and does not make you feel ... [Go to full review]
May 23, 2017
100%
TRUST
TRUST
- Verified Purchaser
- Critical Reviewer (avg. rating: 4.1)
Least Trusted Reviews
Good [Go to full review]
May 17, 2016
35%
TRUST
TRUST
- Verified Purchaser
- Overrepresented word count (1 word)
- Overrepresented Participation (posted 6 Reviews)
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Deleted Reviews
We discovered a total of 78 deleted Reviews for this product, with an average rating of 4.1. 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 Suspicious Reviewers
One-Hit Wonders
37 of the 288 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
58 of the 288 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 Word Count Comparison
-
- 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 143 reviews (or 50%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, the discrepancy in ratings between reviews with overrepresented word groups and all other reviews isn’t significant enough to rule out the possibility of it being due to random chance.
Warn Reviewer Participation
-
- 48%
- 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 137 reviewers (or 48%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.
Pass Rating Trend
-
- 0%
- Created over 4 days
We counted 288 reviews for this product over the span of 1,546 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 4 days exceeding this threshold:
Read more about our Rating Trend test.
However, we see the following 4 days exceeding this threshold:
- 3 Reviews on Mar 15, 2017 (Avg. rating: 5.0)
- 3 Reviews on Jan 8, 2017 (Avg. rating: 4.7)
- 3 Reviews on Aug 12, 2016 (Avg. rating: 3.7)
- 3 Reviews on Mar 4, 2016 (Avg. rating: 1.7)
Read more about our Rating Trend test.
Pass Unverified Purchases
35 of the 288 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 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
7 reviews
(4.0/5)
(4.0/5)
3 reviews
(5.0/5)
(5.0/5)
5 reviews
(4.0/5)
(4.0/5)
3 reviews
(3.0/5)
(3.0/5)
7 reviews
(4.3/5)
(4.3/5)
3 reviews
(5.0/5)
(5.0/5)
3 reviews
(2.0/5)
(2.0/5)
4 reviews
(4.5/5)
(4.5/5)
4 reviews
(3.0/5)
(3.0/5)
3 reviews
(4.0/5)
(4.0/5)
Common Phrases in Titles:
2 reviews
(3.5/5)
(3.5/5)
21 of the 288 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
Reviewers of this product have ALSO reviewed the following products:
3% also reviewed:
Amazon Basics AA High-Performance Alkaline... by Amazon Basics
2% also reviewed:
Amazon Store Card by Synchrony Bank
2% also reviewed:
Natrol Biotin Maximum Strength Tablets,... by Natrol
1% also reviewed:
Hydroxycut Pro Clinical Weight Loss Supplement,... by Hydroxycut
1% also reviewed:
SanDisk Ultra MicroSDXC UHS-I Card with Adapter by SanDisk
1% also reviewed:
The Grand Tour Season 1 by Jeremy Clarkson
38 of the 288 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
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 4.1, while the average ease score for reviewers in this category is 4.3.
4.1 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
30 of the 288 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
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
1 of the 288 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.