Doyle Brunson's Super System
More product info
From Doyle 'Texas Dolly' Brunson
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Report Card
Most Trusted Reviews
TRUST
- Verified Purchaser
- Easy Grader (avg. rating: 4.7)
Least Trusted Reviews
TRUST
- Unverified Purchaser
- Contains repetitive phrases (show)
- Never-Verified Reviewer
- Brand Monogamist (2 of 2 reviews for this brand; avg rating: 4.5)
- Overrepresented Participation (posted 2 Reviews)
- Easy Grader (avg. rating: 4.5)
Analysis Details
One-Hit Wonders
85 of the 428 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.
Never-Verified Reviewers
96 of the 428 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.
Take-Back Reviewers
108 of the 428 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.
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- 44%
- 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 189 reviewers (or 44%) are within an overrepresented participation group. These reviews have rated this product an average of 4.5, while all other reviews 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.
We discovered a total of 11 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.
Brand Loyalists
16 of the 428 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, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.
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- 5%
- Created over 7 days
We counted 428 reviews for this product over the span of 5,851 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 7 days exceeding this threshold:In total, we found that 21 reviews were created on just 7 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
169 of the 428 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.
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- 0%
- Have an overrepresented word count
Read more about our Word Count Comparison test.
(4.5/5)
(3.8/5)
(4.0/5)
(4.0/5)
(4.1/5)
(4.3/5)
(5.0/5)
(4.1/5)
(4.1/5)
(3.9/5)
55 of the 428 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.
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4% also reviewed:
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4% also reviewed:
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3% also reviewed:
Phil Hellmuth Presents Read 'Em and Reap: A... by Navarro, Joe/ Karlins, Marvin
3% also reviewed:
Harrington on Hold 'em: Expert Strategies for No... by Harrington, Dan/ Robertie, Bill
3% also reviewed:
Phil Gordon's Little Green Book: Lessons and... by Phil Gordon
100 of the 428 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.
4.3 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
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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.