Lecture 2 Exam 2

UIC BioS 101 Nyberg

9

Categorical Data

• Discrete (non-overlapping) categories that collectively cover all possibilities

• If one has a model that generates probabilities of being in each possible category, one can use the Chi-squared test to compare the observed outcomes (=numbers) to the expected numbers once the total number of observations is known.

Speaker Notes:

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It is important that the categories are mutually exclusive (non-overlapping) and cover all possibilities (100%).