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Capstar Fast-Acting Oral Flea Treatment for Dogs
More product info From Capstar

Capstar Fast-Acting Oral Flea Treatment for Dogs View product on Amazon.com
Amazon Reviews for Capstar Fast-Acting Oral Flea Treatment for Dogs
Rating:
8,593 Ratings
5,750 Reviews
("Ratings" vs. "Reviews")
6% of potentially unnatural reviews removed (why?)
Adjusted:
5,392 Reviews



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Last Updated: Jul 19, 2021
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Note: While Amazon.com claims 8,593 Ratings, we counted 5,750 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".

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

Most Trusted Reviews

1/5
The vet has given me much better stuff, definitely get what you pay for with ...
I have two dogs and I gave them both the ... [Go to full review]
Mar 2, 2018      
100% TRUST
  • Verified Purchaser
  • Easy Grader (avg. rating: 4.4)

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Least Trusted Reviews

4/5
GREAT PRODUCT..
THIS PRODUCT IS GREAT. NOT FOR EVERYDAY. BEFORE A BATH ... [Go to full review]
Nov 14, 2013      
0% TRUST
  • Verified Purchaser
  • One-Hit Wonder
  • Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
  • Critical Reviewer (avg. rating: 4.0)

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Analysis Details

Fail Deleted Reviews

We discovered a total of 836 deleted Reviews for this product, with an average rating of 4.1. 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.

4.1 average rating of deleted reviews

4.1

Show distribution of deleted reviews

Fail Suspicious Reviewers

One-Hit Wonders


162 of the 5,750 reviewers have only reviewed this product. The One-Hit Wonders have rated this product an average of 3.3 while the reviewers who have posted more than one review have rated this product an average of 4.0. 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 one-hit wonders

from reviewers with more than one review


3.3
4.0

Take-Back Reviewers


2,580 of the 5,750 reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.1 while the reviewers who don't have any deleted reviews in their history have 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 take-back reviewers

from reviewers without previously deleted reviews


4.1
3.8

Read more about our Suspicious Reviewers test.

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


3% also reviewed:
Vet's Best Flea and Tick Home Spray |... by Vet's Best


2% also reviewed:
Victor Safer Brand M230A Ultimate Flea Trap, 1... by Victor


2% also reviewed:
Advantage II Flea Prevention and Treatment for... by Advantage


1% also reviewed:
Amazon Store Card by Synchrony Bank


1% also reviewed:
Coastal Pet Safari Dog Double Row Flea Comb -... by Coastal


1% also reviewed:
Flea Away All Natural Supplement for Fleas,... by Flea Away


1% also reviewed:
Certified Refurbished Fire TV Stick with Alexa... by Amazon Renewed


1% also reviewed:
Fire TV Stick bundle with Echo Dot (2nd Gen) -... by Amazon

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Does not include products
from the same brand


841 of the 5,750 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.3 while the reviewers who have a more unique product review history 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 reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.3
3.9

Read more about our Overlapping Review History test.

Warn Rating Trend

  • 11%
  • Created over 84 days

We counted 5,750 reviews for this product over the span of 5,794 days, an average of 1.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 6 or fewer reviews on any given day.

However, we see the following 84 days exceeding this threshold:In total, we found that 641 reviews were created on just 84 days. 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.

from reviews created on high volume days

from reviews created on normal volume days


4.0
3.9

Read more about our Rating Trend test.

Pass Unverified Purchases

300 of the 5,750 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.

from unverified purchasers

from verified purchases


3.8
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.

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 Phrase Repetition
  • 0%
  • Used substantial repetitive phrases
0 of the 5,750 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.
Read more about our Phrase Repetition test.

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.

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


306 of the 5,750 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


4.3
3.9

Read more about our Brand Repeats 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.

  • 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.