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# Regression Analysis- Some Additional Techniques (1).docx

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Department
Statistics
Course Code
STATS 2B03
Professor
Aaron Childs

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November 23 , 2012 Stats 2B03: Statistical Methods for Science Regression Analysis: Some Additional Techniques (1) 11.2 Qualitative Independent Variables - example: suppose that we want to see whether smoking status can be taken into account to improve our model to predict blood pressure  0 = does not smoke  1 = smokes less than 1 pack per day  2 = smokes one or more packs per day  to do this we have to create 2 dummy or indicator variables  x4= 1 if smoking status = 0 0 if smoking status = 1 or 2  x2= 1 if smoking status = 1 0 if smoking status = 0 or 2 C4 C14 C15 Smoking status X 4 X5 1 1 0 1 2 0 1 0 3 0 1 0 4 0 1 0 5 2 0 0 : : : : - in general to include a qualitative variable with k categories in a regression equation we have to create k-1 dummy or indicator variables - then we fit the regression model - now we want to test whether or not the variables x an4 x add5to th
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