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Types of variables
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Section on Design of
Index
Data description
Subsections
Types of variables
Categorical, qualitative : binary, more than 2 categories.
Stem and leaf
Frequency tables
Histogram
Not Pie-charts
Example:Census data, last digit of age
Choosing the number of bins
Central Tendancy
Mean
Median
Mode
Measures of spread
Root mean square
Standard deviation
Empirical Rule
Susan Holmes
2000-11-28
