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Old 05-24-2011
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Stats What is Categorical Data?

Can anyone explain what is meant by categorical data?

I am confused about when to use a t-test versus a chi-squared test. An example would be greatly appreciated!

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Old 05-24-2011
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Categorical data is the data that can be divided into groups and that are not measured in exact numerical data.

For example:
Age groups, educational levels, gender, race, ...etc

Note that the same variable can also be sometimes numerical for example Age, can be categorical if you speak of age groups but it can also be numerical if you speak of the exact age in years for example.

So you need to see what the question is talking about, see if they are grouped data (categorical) or measured data (numerical).
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Old 05-24-2011
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You'll use X2 to test the null hypothesis of no association between the variables.

the type of categorical data most use for this purpose is fractions and proportions.

as a rule of thumb, if you can build a two by two table, you can use X2.
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