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The Big Bang Theory: Season 1-7 [DVD][2014] [2007]
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From Warner Home Video
This report was last updated 10/3/2017.
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Report Info:
Last Updated: Oct 3, 2017
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Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Fail Overall Grade
FAIL Reviewer Ease
FAIL Word Count Comparison
WARN Rating Trend
WARN Brand Repeats
WARN Suspicious Reviewers
WARN Reviewer Participation
PASS Unverified Purchases
PASS Phrase Repetition
PASS Overlapping Review History
PASS Incentivized Reviews
PASS Deleted Reviews
Most Trusted Reviews
I Just Don't get this.I find this without a doubt ... [Go to full review]
Aug 16, 2015
100%
TRUST
TRUST
- Unverified Purchaser
- Brand Repeater (18 of 285 reviews for this brand; avg rating: 3.4)
- Overlapping Review History: reviewed 3 of 9 top products
- Critical Reviewer (avg. rating: 3.6)
Least Trusted Reviews
Excellent [Go to full review]
Feb 7, 2016
0%
TRUST
TRUST
- Verified Purchaser
- Overrepresented word count (1 word)
- Single-Day Reviewer (posted all reviews on Feb 7, 2016)
- Brand Loyalist (3 of 4 reviews for this brand; avg rating: 5.0)
- Overrepresented Participation (posted 4 Reviews)
- Easy Grader (avg. rating: 5.0)
Analysis Details
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 4.6, while the average ease score for reviewers in this category is 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.
4.6 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
Fail Word Count Comparison
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- 71%
- 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 236 reviews (or 71%) are within an overrepresented word count group. These reviews have rated this product an average of 4.9, while all other reviews have rated this product an average of 4.6. 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 4 days
We counted 332 reviews for this product over the span of 870 days, an average of 0.4 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 4 days exceeding this threshold:In total, we found that 25 reviews were created on just 4 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.
Warn Brand Repeats
Brand Loyalists
10 of the 332 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, it does not appear to have a significant impact on the overall rating.
Warn Suspicious Reviewers
One-Hit Wonders
46 of the 332 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.
Take-Back Reviewers
7 of the 332 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.
Warn Reviewer Participation
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- 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 277 reviewers (or 83%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Unverified Purchases
21 of the 332 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.
Pass Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
6 of the 332 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.
Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
2% also reviewed:
Frozen [DVD] by Chris Buck
2% also reviewed:
Fire TV Stick with Voice Remote | Streaming Media... by Amazon
2% also reviewed:
Amazon.co.uk Gift Card - In a Greeting Card -... by Amazon EU S.à.r.l.
2% also reviewed:
The Hunger Games Trilogy - 3 Book Set by The Hunger Games
2% also reviewed:
Dawn of the Planet of the Apes [DVD] by 20th Century Fox Home Entertainment
2% also reviewed:
The Inbetweeners 2 [DVD] [2014] by Channel 4 DVD
2% also reviewed:
Thor: The Dark World [DVD] [2013] by Walt Disney Home Entertainment
2% also reviewed:
Minions by Brian Lynch
Does not include products
from the same brand
from the same brand
38 of the 332 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.
Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- 0%
- Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
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.