CS570 Biomedical Science & Health IT
CS544 D1
Foundations of Analytics
Lecture 5
Guanglan Zhang
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Types of data
We can classify data into two types:
Qualitative data, associated with a property or a quality
Nominal data, where there is no ranking among the distinct categories
Ordinal data, where there is an implicit ranking among the distinct categories
Quantitative data, associated with a numeric measurement
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This is read “n choose k.”
n! read as “n factorial.”
Univariate Data
Graphical Representations of Categorical Data
Bar plot
Pie chart
Graphical Representations of Numerical Data
Bar plot (showing frequencies of data points)
Dot plot
Stem and leaf plot
Histogram
Box plot
https://www.mathsisfun.com/data/stem-leaf-plots.html
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Bivariate Data
Two-way Tables – Un-summarized Data
Two-way Tables – Summarized Data
Marginal Distributions of Two-way Tables
Conditional Distributions of Two-way Tables
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