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lecture_01 - ILRST 411 STATISTICAL ANALYSIS OF QUALITATIVE...

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                         ILRST 411      STATISTICAL ANALYSIS OF QUALITATIVE  DATA LECTURE 01                  Instructor : TANIA DAS
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               Background 1)     What is categorical data analysis? 2)  Why do I bother to learn categorical data  analysis? 1) What type of methods/analytical methods is it  about?
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                   Background British statistician, Karl Pearson did influential work in 1900  but relatively little  development of models for categorical  responses occurred until the 1960s. The development of methods for categorical variables was  stimulated by research studies in the social and biomedical  sciences. Categorical scales are pervasive in the social sciences for  measuring attitudes and opinions. Categorical scales in  biomedical sciences measure outcomes such as whether a  medical treatment is successful.
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    Few examples For instance,  political philosophy  is often measured as  liberal moderate , or  conservative . In behavioral sciences (eg,  type of mental illness  with the  categories  depression, neurosis ) In epidemiology and public health (eg,  smoking habit  for  example  often, sometimes, rarely,never)
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    Few examples In medical science (eg,  diagnosis regarding breast  cancer  on a mammogram using the categories  normal,  benign, probably benign, suspicious  and  malignant . In marketing (eg,  consumer preference  among leading  brands of a product , with the categories  brand A, brand  B  and  brand C .
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               What is categorical data?
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