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Zmodo Wireless Security Camera System (4 Pack) , Smart Home HD Indoor Outdoor WiFi IP Cameras with...
More product info From Zmodo

Amazon Reviews for  Zmodo Wireless Security Camera System (4 Pack) , Smart Home HD Indoor Outdoor WiFi IP Cameras with Night Vision, 1-month Free Cloud Recording
Rating:
21,469 Ratings
9,559 Reviews
("Ratings" vs. "Reviews")
32% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
Jump to Report Card
Report Info:
Last Updated: May 17, 2021
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Note: While Amazon.com claims 21,469 Ratings, we counted 9,559 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

Report Card

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

Most Trusted Reviews

Great motion sensing but wish it had voice control [Go to full review]
Dec 23, 2019      
100% TRUST
  • Verified Purchaser
  • Take-Back Reviewer (3 deleted Reviews; avg. rating: 4.3)
  • Easy Grader (avg. rating: 4.5)


Least Trusted Reviews

These cameras work perfectly. It is a lot clearer than ... [Go to full review]
Sep 26, 2017      
0% TRUST
  • Unverified Purchaser
  • Created on a high volume day
  • Never-Verified Reviewer
  • Single-Day Reviewer (posted all reviews on Sep 26, 2017)
  • Brand Monogamist (2 of 2 reviews for this brand; avg rating: 5.0)
  • Overrepresented Participation (posted 2 Reviews)
  • Easy Grader (avg. rating: 5.0)


Analysis Details

Fail Rating Trend

  • 17%
  • Created over 70 days

We counted 9,559 reviews for this product over the span of 1,974 days, an average of 4.8 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 14 or fewer reviews on any given day.

However, we see the following 70 days exceeding this threshold:In total, we found that 1,658 reviews were created on just 70 days. The reviews on these high volume days have rated this product an average of 4.2 while reviews from other days have rated this product an average of 3.6. 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.

from reviews created on high volume days

from reviews created on normal volume days


4.2
3.6


Read more about our Rating Trend test.

Fail Unverified Purchases

1,932 of the 9,559 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.1 while the verified purchasers have rated this product an average of 3.6. 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.

from unverified purchasers

from verified purchases


4.1
3.6


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


466 of the 9,559 reviewers have never written a verified purchase review. The Never-Verified Reviewers have rated this product an average of 4.2 while the reviewers who have written at least one verified purchase review rated this product an average of 3.7. 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.

from never-verified reviewers

from reviewers with at least one verified purchase review


4.2
3.7


Single-Day Reviewers


106 of the 9,559 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.2 while all other reviewers rated this product an average of 3.7. 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.

from single-day reviewers

from non-single-day reviewers


4.2
3.7


Read more about our Suspicious Reviewers test.

Fail Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.

Common Phrases in Reviews:
526 reviews
(4.5/5)
298 reviews
(3.8/5)
211 reviews
(3.4/5)
Common Phrases in Titles:
187 reviews
(4.0/5)
126 reviews
(4.6/5)


396 of the 9,559 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.6 while reviews without substantial repetitive phrases rated this product an average of 3.7. 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.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.6
3.7


Read more about our Phrase Repetition test.

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

Does not include products
from the same brand


463 of the 9,559 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 3.9 while the reviewers who have a more unique product review history rated this product an average of 3.7. 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.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


3.9
3.7


Read more about our Overlapping Review History test.

Warn Deleted Reviews

We discovered a total of 246 deleted Reviews for this product, with an average rating of 4. 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.

4.0 average rating of deleted reviews

4.0


Show distribution of deleted reviews

Warn Brand Repeats

Brand Loyalists


214 of the 9,559 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, the discrepancy in ratings between the Brand Loyalists and non-loyalists isn't significant enough to rule out the possibility of it being due to random chance.

from Brand Loyalists

from Non-Loyalists


4.5
3.7


Read more about our Brand Repeats test.

Warn Reviewer Participation

  • 36%
  • 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 3444 reviewers (or 36%) are within an overrepresented participation group. While this is more reviews from overrepresented participation groups than we'd expect to see, the discrepancy in ratings between reviewers in an overrepresented participation groups and all other reviewers isn’t significant enough to rule out the possibility of it being due to random chance.

From reviewers with an overrepresented participation

From reviewers with a properly represented participation


3.8
3.7


Read more about our Reviewer Participation test.

Pass Word Count Comparison

  • 0%
  • Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison 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 4.1.

4.0 Product's Average Ease Score

4.1 Category's Average Ease Score


4.0
4.1


Read more about our Reviewer Ease test.


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.


4 of the 9,559 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from incentivized reviews

from non-incentivized reviews


4.5
3.7


Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.