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Z-Matrix
More product info From EVLUTION NUTRITION

Amazon Reviews for Z-Matrix
Rating:
102 Reviews
81% of potentially unnatural reviews removed (Why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Jul 19, 2017
Note: While Bodybuilding.com claims 102 reviews, we counted 96 available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Top products in All Bodybuilding.com Products with authentic reviews:


Stringer Tank



Adjusted
Rating:
1 Review

Report Card

Fail Overall Grade
FAIL Unverified Purchases
FAIL Brand Repeats
FAIL Suspicious Reviewers
FAIL Reviewer Ease
FAIL Word Count Comparison
WARN Deleted Reviews
WARN Rating Trend
WARN Phrase Repetition
PASS Overlapping Review History
PASS Reviewer Participation
PASS Sample Reviews

Most Trusted Reviews

10/10
Good product [Go to full review]
Mar 17, 2016     1 of 1 found this helpful.  
95% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 10.0)


Least Trusted Reviews

10/10
Z-Matrix is an amazing product made by an amazing company ... [Go to full review]
May 4, 2016      
0% TRUST
  • Unverified Purchaser
  • Overrepresented word count (26 words)
  • Contains repetitive phrases (show)
  • Never-Verified Reviewer
  • Take-Back Reviewer (1 deleted review; avg. rating: 10.0)
  • Brand Monogamist (10 of 10 reviews for this brand; avg rating: 10.0)
  • Easy Grader (avg. rating: 10.0)


Analysis Details

Fail Unverified Purchases

39 of the 96 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 9.6 while the verified purchasers have rated this product an average of 8.9. 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.

from unverified purchasers

from verified purchases


9.6
8.9


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 Brand Repeats

Brand Repeaters


60 of the 96 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.

from Brand Repeaters

from Non-Repeaters


9.5
8.7


Brand Loyalists


47 of the 96 reviewers have reviewed multiple products but half or more of their reviews are for this brand. This is an excessively large percentage of Brand Loyalists which may indicate unnatural reviews.

from Brand Loyalists

from Non-Loyalists


9.6
8.8


Brand Monogamists


32 of the 96 reviewers have reviewed multiple products, but only for this brand. This is an excessively large percentage of Brand Monogamists which may indicate unnatural reviews.

from Brand Monogamists

from Non-Monogamists


9.5
9.0


Read more about our Brand Repeats test.

Fail Suspicious Reviewers

One-Hit Wonders


21 of the 96 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, the discrepancy in ratings between the One-Hit Wonders and reviewers who have posted more than one review isn't significant enough to rule out the possibility of it being due to random chance.

from one-hit wonders

from reviewers with more than one review


9.3
9.2


Never-Verified Reviewers


23 of the 96 reviewers have never written a verified purchase review. While this is more Never-Verified Reviewers than we'd expect to see, the discrepancy in ratings between the Never-Verified Reviewers and reviewers who have written at least one verified purchase review isn't significant enough to rule out the possibility of it being due to random chance.

from never-verified reviewers

from reviewers with at least one verified purchase review


9.7
9.0


Take-Back Reviewers


33 of the 96 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.

from take-back reviewers

from reviewers without previously deleted reviews


9.4
9.1


Read more about our Suspicious Reviewers test.

Fail 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 9.3, while the average ease score for reviewers in this category is 8.8. 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.

9.3 Product's Average Ease Score

8.8 Category's Average Ease Score


9.3
8.8


Read more about our Reviewer Ease test.


Fail Word Count Comparison

  • 32%
  • 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 31 reviews (or 32%) are within an overrepresented word count group. These reviews have rated this product an average of 9.7, while all other reviews have rated this product an average of 9.0. 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.

from reviews with an overrepresented word count

from reviews with a properly represented word count


9.7
9.0


Read more about our Word Count Comparison test.

Warn Deleted Reviews

We discovered a total of 4 deleted reviews for this product, with an average rating of 10. 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:
  1. 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.
  2. We have no information on reviews that were never published in the first place.
  3. 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.
Read more about the Deleted Reviews test here.

10.0 average rating of deleted reviews

10.0


Show distribution of deleted reviews

Warn Rating Trend

  • 25%
  • Created over 5 days

We counted 96 reviews for this product over the span of 722 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 24 reviews were created on just 5 days. This is an excessively high number of reviews submitted on these high volume days.

from reviews created on high volume days

from reviews created on normal volume days


9.7
9.0


Read more about our Rating Trend test.

Warn Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.



43 of the 96 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


9.3
9.1


Read more about our Phrase Repetition test.

Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:

7% also reviewed:
DyNO by RSP Nutrition

7% also reviewed:
WHEY by RSP Nutrition

5% also reviewed:
1.M.R Vortex by BPI Sports

4% also reviewed:
Post JYM Active Matrix by JYM

4% also reviewed:
Pre JYM by JYM

4% also reviewed:
Z-Elite by RSP Nutrition

3% also reviewed:
Platinum Multivitamin by MuscleTech

3% also reviewed:
FitJoy Bars by FitJoy

Does not include products
from the same brand


22 of the 96 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


9.3
9.2


Read more about our Overlapping Review History test.

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.

Pass Sample Reviews

1 of the 96 total reviews for this product mentioned the word "sample" within their review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews that use the word "sample"

from reviews that don't use the word "sample"


9.0
9.2


Read more about our Sample Reviews test.


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