Catergorical Explanatory Variables : Contrast Coding, Dummy Codes and Reference Categories
|Starts:||10:00 27 Feb 2013|
|Ends:||12:00 27 Feb 2013|
|What is it:||Seminar|
|Organiser:||School of Arts, Languages and Cultures|
|Who is it for:||Current University students, University staff|
Categorical explanatory variables can be easily included in statistical models using contrast coding techniques. Althgough there are a number of techniques available, many users only apply the default option provided by the statistical software.
This is a shame, as the different coding schemes are very useful and can, for example, provide different group comparisons, test for ordered effects, illustrate differences between individual categories and identify non-linear trends. This session shows how to use and interpret a number of contrast coding techniques and also manipulate the reference category to provide specific comparisons.
Although this session is illustrated using R and the Rcmdr, the techniques described can be easily applied using other packages.
Booking Form : http://www.methods.manchester.ac.uk/events/2013-02-27/booking.shtml
Travel and Contact Information
Coupland Building 3