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==Qualitative data==
 
==Qualitative data==
Qualitative data may be relatively subjectively defined, or are not numerical in nature.  
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Qualitative data are 'categorical' (or binary) data, and as such are often not expressed numerically. These types of data can be classified as '''nominal''' and '''ordinal''':
 
===Nominal===
 
===Nominal===
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Nominal data include binary ('yes/no') and categorical data types, and are characterised by lacking any order between the different categories. As such, examples of nominal data are disease status (positive/negative), sex (male/female), breed and coat colour. As there is no numerical meaning to the data, nominal data are usually summarised with percentages or proportions.
    
===Ordinal===
 
===Ordinal===
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Ordinal data
    
==Quantitative data==
 
==Quantitative data==
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