Rubank Advanced Method: Flute, Vol. 1 (Rubank Educational Library, No. 95)
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From Voxman, H. (COP)/ Gower, Wm (COP)
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Most Trusted Reviews
TRUST
- Verified Purchaser
- Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
- Critical Reviewer (avg. rating: 4.3)
Least Trusted Reviews
TRUST
- Verified Purchaser
- Take-Back Reviewer (4 deleted Reviews; avg. rating: 4.5)
- Overlapping Review History: reviewed 1 of 9 top products
- Overrepresented Participation (posted 17 Reviews)
- Easy Grader (avg. rating: 4.4)
Analysis Details
Take-Back Reviewers
5 of the 45 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
10 of the 45 reviewers have written multiple reviews but posted all of them on a single day. While this is more Single-Day Reviewers than we'd expect to see, it does not appear to have a significant impact on the overall rating.
4.6 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
20% also reviewed:
Rubank Intermediate Method: Flute or Piccolo... by Hal Leonard
20% also reviewed:
Rubank Advanced Method - Flute Vol. 2 (Rubank... by Brand: Rubank, Inc.
13% also reviewed:
Rubank Elementary Method - Flute or Piccolo... by Rubank Publications
11% also reviewed:
Missing Pieces by Heather Gudenkauf
11% also reviewed:
Dear Killer by Katherine Ewell
9% also reviewed:
Living In The Material World by Not Applicable
7% also reviewed:
The Beatles: The Authorized Biography by McGraw Hill
7% also reviewed:
The Lonely Hearts Club by Elizabeth Eulberg
7% also reviewed:
Somebody Else's Kids Publisher: Avon by Torey L. Hayden
13 of the 45 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.2 while the reviewers who have a more unique product review history rated this product an average of 4.9. 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.
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- 62%
- 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 28 reviewers (or 62%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
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- 0%
- Created on high-volume days
Read more about our Rating Trend test.
4 of the 45 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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- 27%
- 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 12 reviews (or 27%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
1 of the 45 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.
Brand Repeaters
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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.
- 0
- Reviews have been deleted
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.