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DigHealth 電動エアコンプレッサー コードレス エアコンプレッサー...
More product info

Amazon Reviews for  DigHealth 電動エアコンプレッサー コードレス エアコンプレッサー 電動空気入れ 自動車 自転車 トラック バイク ボール 浮き輪適用 2200AM電池 LEDライト付き 日本語取扱説明書付き
Rating:
904 Ratings
502 Reviews
("Ratings" vs. "Reviews")
26% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
Jump to Report Card
Report Info:
Last Updated: Sep 13, 2020
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Show Report History
Note: While Amazon.co.jp claims 904 Ratings, we counted 502 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
1

Report Card

Pass Overall Grade
FAIL Deleted Reviews
FAIL Unverified Purchases
FAIL Overlapping Review History
WARN Suspicious Reviewers
WARN Word Count Comparison
WARN Reviewer Participation
PASS Rating Trend
PASS Reviewer Ease
PASS Brand Repeats
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]
Nov 30, 2019      
73% TRUST
  • Verified Purchaser
  • Overrepresented word count (0 words)
  • Take-Back Reviewer (6 deleted Reviews; avg. rating: 4.3)
  • Easy Grader (avg. rating: 4.9)


Least Trusted Reviews

2/5
User did not leave written text for this review. [Go to full review]
Aug 19, 2020      
0% TRUST
  • Unverified Purchaser
  • Overrepresented word count (0 words)
  • Take-Back Reviewer (2 deleted Reviews; avg. rating: 5.0)
  • Overlapping Review History: reviewed 2 of 9 top products
  • Overrepresented Participation (posted 18 Reviews)
  • Critical Reviewer (avg. rating: 3.8)


Analysis Details

Fail Deleted Reviews

We discovered a total of 379 deleted Reviews for this product, with an average rating of 5. 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 our Deleted Reviews test.

5.0 average rating of deleted reviews

5.0


Show distribution of deleted reviews

Fail Unverified Purchases

19 of the 502 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 3.0 while the verified purchasers have rated this product an average of 3.9. 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


3.0
3.9


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

2% also reviewed:
YouTube by Google LLC

1% also reviewed:
Fire TV Stick -... by

1% also reviewed:
【令和革新モデル... by

1% also reviewed:
Echo Dot 第3世代 -... by Amazon

Does not include products
from the same brand


44 of the 502 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.4 while the reviewers who have a more unique product review history 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.4
3.8


Read more about our Overlapping Review History test.

Warn Suspicious Reviewers

One-Hit Wonders


77 of the 502 reviewers have only reviewed this product. While this is more One-Hit Wonders than we'd expect to see, it does not appear to have a significant impact on the overall rating.

from one-hit wonders

from reviewers with more than one review


3.8
3.9


Read more about our Suspicious Reviewers test.

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


  • 100%
  • 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 502 reviews (or 100%) 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


3.8
N/A


Read more about our Word Count Comparison test.

Warn Reviewer Participation

  • 83%
  • 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 418 reviewers (or 83%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


3.8
4.2


Read more about our Reviewer Participation test.

Pass Rating Trend

  • 3%
  • Created over 2 days

We counted 502 reviews for this product over the span of 605 days, an average of 0.8 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 5 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 14 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


4.4
3.8


Read more about our Rating Trend 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, while the average ease score for reviewers in this category is 4.2.

4.0 Product's Average Ease Score

4.2 Category's Average Ease Score


4.0
4.2


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters


4 of the 502 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from Brand Repeaters

from Non-Repeaters


4.8
3.8


Read more about our Brand Repeats 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.