5 ms·
Rubrics And The Bimodality Of 1-5 Ratings
- urlwolf 17y agoAnyone knows a reference for this bimodality Of 1-5 Ratings? This is not what I see in amazon. Votes are not normally distributed, sure, but they tend to cluster on the upper end of the scale. The mean for amazon votes (note that since the distribution is not normal, the mean is meaningless) is something like 3.4.
- mattyb 17y agoQuite possibly a terrible example (+ hasty generalization, etc.), but here goes: http://www.amazon.com/Structure-Interpretation-Computer-Programs-Engineering/product-reviews/0262011530/ref=sr_1_1_cm_cr_acr_img?ie=UTF8&showViewpoints=1 http://www.amazon.com/Structure-Interpretation-Computer-Prog...
- adi92 17y agoI think a closed forum with users who have established definitions for the difference between what each number of the scale implies would have a bimodal distribution. Sites like youtube ( http://youtube-global.blogspot.com/2009/09/five-stars-dominate-ratings.html http://youtube-global.blogspot.com/2009/09/five-stars-domina... ) and amazon ( http://portal.acm.org/citation.cfm?id=1562764.1562800&coll=GUIDE&dl=GUIDE&CFID=60275918&CFTOKEN=83708949 http://portal.acm.org/citation.cfm?id=1562764.1562800&co... ) have more of a J-curve
- CoryOndrejka 17y agoI can't find solid analysis of Amazon's rating system, but neither YouTube nor Netflix are bimodal: * YouTube is all 5 stars (http://youtube-global.blogspot.com/2009/09/five-stars-dominate-ratings.html http://youtube-global.blogspot.com/2009/09/five-stars-domina...) * Netflix: 3, 4, and 5 dominate (http://www.timelydevelopment.com/demos/NetflixPrize.aspx http://www.timelydevelopment.com/demos/NetflixPrize.aspx)
- wsprague 17y agoI liked the way he applies moderately useful statistics to a real world application, mostly just as an example of how we all could be using the standard deviation along with the mean.