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Taisho Pharmaceutical Co. New Biofermin S Pill (Specified Quasi Drug), , ,
More product info From Visit the ビオフェルミン Store

Amazon Reviews for  Taisho Pharmaceutical Co. New Biofermin S Pill (Specified Quasi Drug), , ,
Rating:
1,950 Ratings
578 Reviews
("Ratings" vs. "Reviews")
7% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
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Report Info:
Last Updated: Jan 26, 2021
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Note: While Amazon.co.jp claims 1,950 Ratings, we counted 578 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

5/5
User did not leave written text for this review. [Go to full review]
Oct 22, 2018      
73% TRUST
  • Verified Purchaser
  • Overrepresented word count (0 words)
  • Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
  • Overlapping Review History: reviewed 3 of 9 top products
  • Easy Grader (avg. rating: 4.7)


Least Trusted Reviews

4/5
User did not leave written text for this review. [Go to full review]
Oct 21, 2019      
0% TRUST
  • Unverified Purchaser
  • Overrepresented word count (0 words)
  • Never-Verified Reviewer
  • Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
  • Overrepresented Participation (posted 6 Reviews)
  • Critical Reviewer (avg. rating: 4.2)


Analysis Details

Fail Unverified Purchases

41 of the 578 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.5 while the verified purchasers have rated this product an average of 4.4. 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


3.5
4.4


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 Suspicious Reviewers

Never-Verified Reviewers


8 of the 578 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 2.8 while the reviewers who have written at least one verified purchase review rated this product an average of 4.4. 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 never-verified reviewers

from reviewers with at least one verified purchase review


2.8
4.4


Read more about our Suspicious Reviewers test.

Warn Word Count Comparison
Word counts are approximated for Hanzi and Kanji


  • 99%
  • 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 570 reviews (or 99%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.3
3.8


Read more about our Word Count Comparison test.

Warn Reviewer Participation

  • 46%
  • 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 266 reviewers (or 46%) 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.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


4.3
4.4


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 2%
  • Created over 2 days

We counted 578 reviews for this product over the span of 1,145 days, an average of 0.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 11 reviews were created on just 2 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews created on high volume days

from reviews created on normal volume days


4.6
4.3


Read more about our Rating Trend test.

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

Does not include products
from the same brand


54 of the 578 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


4.4
4.3


Read more about our Overlapping Review History 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 4.2, while the average ease score for reviewers in this category is 4.2.

4.2 Product's Average Ease Score

4.2 Category's Average Ease Score


4.2
4.2


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

Pass Deleted Reviews
  • 0
  • Reviews have been deleted
We have not discovered any deleted reviews for this product.

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 our Deleted Reviews test.

N/A Phrase Repetition
We have not yet completed optimization for this test for Hanzi or Kanji.

N/A Incentivized Reviews
We have not yet completed optimization for this test for Hanzi or Kanji.