Close
Amazon.com > Power & Hand Tools > Power Tool Parts & Accessories > Power Drill Parts & Accessories > Drill Bits
BLACK+DECKER 15557 10-Piece Drill Bit Set
More product info
From BLACK+DECKER
This report was last updated 7/6/2020.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
View/Edit Adjustment
Jump to Report Card
Report Card
Pass Overall Grade
FAIL Suspicious Reviewers
FAIL Word Count Comparison
WARN Deleted Reviews
WARN Brand Repeats
PASS Rating Trend
PASS Unverified Purchases
PASS Phrase Repetition
PASS Overlapping Review History
PASS Reviewer Participation
PASS Reviewer Ease
PASS Incentivized Reviews
Most Trusted Reviews
Bought for a starter kit to go with Black and ... [Go to full review]
Feb 7, 2020
100%
TRUST
TRUST
- Verified Purchaser
- Contains repetitive phrases (show)
- Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
- Brand Repeater (3 of 87 reviews for this brand; avg rating: 5.0)
- Easy Grader (avg. rating: 4.9)
Least Trusted Reviews
very satisfied [Go to full review]
Feb 15, 2016
0%
TRUST
TRUST
- Verified Purchaser
- Overrepresented word count (2 words)
- Single-Day Reviewer (posted all reviews on Feb 15, 2016)
- Brand Loyalist (3 of 5 reviews for this brand; avg rating: 5.0)
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Suspicious Reviewers
Never-Verified Reviewers
8 of the 1,299 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 2.6 while the reviewers who have written at least one verified purchase review 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.
Take-Back Reviewers
691 of the 1,299 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.
Single-Day Reviewers
53 of the 1,299 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 4.4 while all other reviewers 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.
Fail Word Count Comparison
-
- 37%
- 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 477 reviews (or 37%) are within an overrepresented word count group. These reviews have rated this product an average of 4.6, while all other reviews have rated this product an average of 3.8. 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 Deleted Reviews
We discovered a total of 62 deleted Reviews for this product, with an average rating of 4.2. 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.
Warn Brand Repeats
Brand Repeaters
725 of the 1,299 reviewers have reviewed other products for this brand. While this is more Brand Repeaters than we'd expect to see, the discrepancy in ratings between the Brand Repeaters and non-repeaters isn't significant enough to rule out the possibility of it being due to random chance.
Brand Loyalists
28 of the 1,299 reviewers have reviewed multiple products but half or more of their reviews are for this brand. While this is more Brand Loyalists than we'd expect to see, it does not appear to have a significant impact on the overall rating.
Pass Rating Trend
-
- 2%
- Created over 5 days
We counted 1,299 reviews for this product over the span of 3,882 days, an average of 0.3 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 5 days exceeding this threshold:In total, we found that 21 reviews were created on just 5 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Unverified Purchases
87 of the 1,299 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.
70 of the 1,299 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:
2% also reviewed:
Amazon Store Card by Synchrony Bank
2% also reviewed:
CH Hanson 03040 Magnetic Stud Finder by CH Hanson
2% also reviewed:
Amazon Prime Video by Amazon.com
2% also reviewed:
Echo Dot (2nd Generation) - Smart speaker with... by Amazon
2% also reviewed:
AmazonBasics AA Rechargeable Batteries (8-Pack)... by AmazonBasics
194 of the 1,299 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
-
- 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 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 4.3, while the average ease score for reviewers in this category is 4.2. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.
4.3 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
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.
-
- 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.