Catergorical Explanatory Variables : Contrast Coding, Dummy Codes and Reference Categories
| Dates: | 27 February 2013 |
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| Times: | 10:00 - 12:00 |
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| What is it: | Seminar |
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| Organiser: | School of Arts, Languages and Cultures |
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| Who is it for: | Current University students, University staff |
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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
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LG9
Coupland Building 3
Manchester
