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R Statistical Programming Tutorial• 5 min read
Factors & Categorical Variables
Represent categorical data (e.g. Treatment vs Control, Low/Med/High) with statistical factor levels.
Why Factors Outperform Strings
In statistical modeling, string text must be mapped to discrete levels. Calling factor(vector, levels = c("Low", "Med", "High")) allows regression algorithms to construct dummy contrast matrices automatically.
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Test Yourself With Exercise
Which R function converts a character vector into a statistical categorical variable with distinct levels?