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How to Develop Self-Confidence and Influence People by Public Speaking
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From Dale Carnegie
This report was last updated 1/19/2021.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.com claims 7,825 Ratings, we counted 7,608 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Top products in Relationships with authentic reviews:
Report Card
Pass Overall Grade
FAIL 
Phrase Repetition
Phrase RepetitionFAIL Overlapping Review History
Overlapping Review HistoryWARN Deleted Reviews
Deleted ReviewsWARN Rating Trend
Rating TrendWARN Suspicious Reviewers
Suspicious ReviewersWARN Reviewer Participation
Reviewer ParticipationPASS Unverified Purchases
Unverified PurchasesPASS Word Count Comparison
Word Count ComparisonPASS Reviewer Ease
Reviewer EasePASS Brand Repeats
Brand RepeatsPASS Incentivized Reviews
Incentivized Reviews
Most Trusted Reviews
One principle really hit me in this book more than ... [Go to full review]
Sep 7, 2007 2 of 2 found this helpful.
100%
TRUST
TRUST
-
Unverified Purchaser
-
Take-Back Reviewer (111 deleted Reviews; avg. rating: 4.1) -
Critical Reviewer (avg. rating: 4.0)
Least Trusted Reviews
The title and the purpose of the book seem to ... [Go to full review]
May 18, 2016
46%
TRUST
TRUST
-
Unverified Purchaser
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Created on a high volume day
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Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
-
Overrepresented Participation (posted 6 Reviews) -
Critical Reviewer (avg. rating: 3.8)
Analysis Details
Fail Phrase Repetition
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:
Show MoreShow Less
159 reviews
(4.6/5)
(4.6/5)
68 reviews
(5.0/5)
(5.0/5)
237 reviews
(4.8/5)
(4.8/5)
199 reviews
(4.7/5)
(4.7/5)
176 reviews
(4.5/5)
(4.5/5)
199 reviews
(4.5/5)
(4.5/5)
161 reviews
(4.6/5)
(4.6/5)
207 reviews
(4.5/5)
(4.5/5)
180 reviews
(4.6/5)
(4.6/5)
87 reviews
(5.0/5)
(5.0/5)
468 of the 7,608 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.8 while reviews without substantial repetitive phrases 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.
Fail Overlapping Review History
Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
5% also reviewed:
Think and Grow Rich by Napoleon Hill
2% also reviewed:
Rich Dad Poor Dad: 20th Anniversary Edition: What... by Robert T. Kiyosaki
1% also reviewed:
The 7 Habits of Highly Effective People: Powerful... by Stephen R. Covey
1% also reviewed:
The Richest Man In Babylon by George S Clason
1% also reviewed:
The Power of Habit (Turtleback School &... by Charles Duhigg
1% also reviewed:
The 4-Hour Workweek: Escape 9-5, Live Anywhere,... by Ray Porter
1% also reviewed:
The 7 Habits of Highly Effective People: Powerful... by Stephen R. Covey
1% also reviewed:
Outliers, The Story of Success by Malcolm Gladwell
Does not include products
from the same brand
from the same brand
932 of the 7,608 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.8 while the reviewers who have a more unique product review history 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 Deleted Reviews
Deleted Reviews
We discovered a total of 102 deleted Reviews for this product, with an average rating of 4.8. 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:
- 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.
4.8 average rating of deleted reviews
Warn Rating Trend
Rating Trend
-
- 15%
- Created over 167 days
We counted 7,608 reviews for this product over the span of 8,538 days, an average of 0.9 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 167 days exceeding this threshold:In total, we found that 1,154 reviews were created on just 167 days. This is an excessively high number of reviews submitted on these high volume days.
Warn Suspicious Reviewers
Suspicious Reviewers
Take-Back Reviewers
2,418 of the 7,608 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, it does not appear to have a significant impact on the overall rating.
Warn Reviewer Participation
Reviewer Participation
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- 60%
- 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 4588 reviewers (or 60%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass Unverified Purchases
Unverified Purchases
1,228 of the 7,608 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 Word Count Comparison
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.
Read more about our Word Count Comparison test.
Pass Reviewer Ease
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 4.4, while the average ease score for reviewers in this category is 4.4.
4.4 Product's Average Ease Score
4.4 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeats
Brand Repeaters
232 of the 7,608 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.
Pass Incentivized Reviews
Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
2 of the 7,608 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.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.