tag:blogger.com,1999:blog-3240271627873788873.post6524683304063910115..comments2024-03-26T06:46:11.752-04:00Comments on Doing Bayesian Data Analysis: Which movie is rated better? (Don't treat ordinal ratings as metric)John K. Kruschkehttp://www.blogger.com/profile/17323153789716653784noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-3240271627873788873.post-3450620574497075132018-02-09T06:43:05.590-05:002018-02-09T06:43:05.590-05:00An example of a hierarchical model for ordinal dat...An example of a hierarchical model for ordinal data appears in this paper (linked below). Be sure to check its Appendix for the model specification.<br /><br />https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2519218<br />John K. Kruschkehttps://www.blogger.com/profile/17323153789716653784noreply@blogger.comtag:blogger.com,1999:blog-3240271627873788873.post-19559128057145041542018-02-08T16:36:38.967-05:002018-02-08T16:36:38.967-05:00"I'm left wondering how to "properly..."I'm left wondering how to "properly" create scale scores from a set of ordinal items." To clarify, in a Bayesian framework, preferably using R. Ianhttps://www.blogger.com/profile/04188007809763229090noreply@blogger.comtag:blogger.com,1999:blog-3240271627873788873.post-50989030193277324992018-02-08T15:43:39.182-05:002018-02-08T15:43:39.182-05:00Thanks, I've found these references quite help...Thanks, I've found these references quite helpful. However, after reading the manuscript linked above, I'm left wondering how to "properly" create scale scores from a set of ordinal items. Furthermore, if responses to the items were observed at the individual level, how might the scale scores be aggregated to the group level for subsequent analyses? Do you have any references to suggest? (I'm in the midst of analyzing the last bit of data for my dissertation and these issues are manifest :)Ianhttps://www.blogger.com/profile/04188007809763229090noreply@blogger.comtag:blogger.com,1999:blog-3240271627873788873.post-26213502063291387032018-01-05T15:08:51.988-05:002018-01-05T15:08:51.988-05:00This is a nice application but still assumes the r...This is a nice application but still assumes the raters are calibrated. To avoid that assumption, you need to get within-person ratings, which incurs lots of missing values. The problem can then be treated as a large Stratified Cox Proportion Hazards model (e.g. partial rankings.)Bill Rhttps://www.blogger.com/profile/16756950826166022532noreply@blogger.comtag:blogger.com,1999:blog-3240271627873788873.post-79296193325907071992017-12-29T09:33:37.083-05:002017-12-29T09:33:37.083-05:00As in ANY modeling, there is no guarantee that a u...As in ANY modeling, there is no guarantee that a useful model is a correct model. But here the ordered probit is clearly a much more accurate descriptive model.<br /><br />The ordered probit can produce all sorts of curious histograms, including extreme responses. The examples here are U shaped. See DBDA2E for trimodal, etc.John K. Kruschkehttps://www.blogger.com/profile/17323153789716653784noreply@blogger.comtag:blogger.com,1999:blog-3240271627873788873.post-41949309793760413872017-12-28T08:20:33.942-05:002017-12-28T08:20:33.942-05:00The ordered probit model assumes that there people...The ordered probit model assumes that there people's ratings come from a single underlying normal distribution. And on the wild West of the internet, one wonders if that is really true.<br /><br />How well does it behave if, for example, people only vote the extreme values?Ghttps://www.blogger.com/profile/14938984056776222448noreply@blogger.com