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【2019最新型】外付け DVD ドライブ USB3.0 CD DVD プレイヤー CD/VCD読取・書込...
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This report was last updated 9/11/2019.
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Report Card
Fail Overall Grade
FAIL Unverified Purchases
FAIL Suspicious Reviewers
FAIL Reviewer Ease
FAIL Overlapping Review History
WARN Rating Trend
WARN Word Count Comparison
PASS Reviewer Participation
PASS Brand Repeats
PASS Deleted Reviews
N/A Phrase Repetition
N/A Incentivized Reviews
Most Trusted Reviews
We couldn't find any quality reviewsLeast Trusted Reviews
とても薄型で軽量なので... [Go to full review]
Jul 10, 2019
0%
TRUST
TRUST
- Verified Purchaser
- Overrepresented word count (63 words)
- Take-Back Reviewer (37 deleted Reviews; avg. rating: 4.9)
- Overlapping Review History: reviewed 2 of 9 top products
- Critical Reviewer (avg. rating: 4.2)
Analysis Details
Fail Unverified Purchases
1 of the 156 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 1.0 while the verified purchasers have rated this product an average of 4.8. 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.
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
One-Hit Wonders
4 of the 156 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.0 while the reviewers who have posted more than one review have rated this product an average of 4.8. 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.
Never-Verified Reviewers
1 of the 156 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 1.0 while the reviewers who have written at least one verified purchase review rated this product an average of 4.8. 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.
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 4.8, while the average ease score for reviewers in this category is 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.
4.8 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
13% also reviewed:
【2019最新改良】エアーマット... by GMAULEE
12% also reviewed:
RAVPower モバイルバッテリー 搭載 USB... by
12% also reviewed:
【2019改良型】外付け DVDドライブ... by ZENLO
12% also reviewed:
【120時間連続駆動... by AKIKI
11% also reviewed:
Kimitech ハンディクリーナー ハンド... by Kimitech
9% also reviewed:
Vkaiy EMS スタイルマット... by Vkaiy
9% also reviewed:
USB C ハブ Type C... by COMROLL
9% also reviewed:
XXZU 自撮り棒 ミニ三脚 セルカ棒... by XXZU
8% also reviewed:
【Bluetooth5.0 最先端 USB... by Boltune
63 of the 156 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 5.0 while the reviewers who have a more unique product review history rated this product an average of 4.7. 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.
Warn Rating Trend
-
- 8%
- Created over 1 day
We counted 156 reviews for this product over the span of 70 days, an average of 2.2 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 9 or fewer reviews on any given day.
However, we see the following 1 day exceeding this threshold:In total, we found that 13 reviews were created on just 1 day. Although any days with a larger number of reviews than expected is suspicious, the discrepancy in ratings from reviews created on these high volume days and reviews created on other days isn't significant enough to rule out the possibility of it being due to random chance.
Warn Word Count Comparison
Word counts are approximated for Hanzi and Kanji
-
- 79%
- 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 2 groups with a statistically significant greater concentration than what we'd expect to see:In total, we found that 123 reviews (or 79%) are within an overrepresented word count group. This is an excessively high number of reviews in overrepresented word count groups.
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.
Read more about our Reviewer Participation 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:
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.
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.