R Data StructuresLesson 23Free preview

R Factors

This lesson is part of R · All levels

Summary

This lesson discusses Factors in R that are specifically designed to handle categorical data. The categorical variables have a finite set of values called 'levels'. Factors are very crucial in statistical modeling such as linear regression and ANOVA to differentiate group treatment.

Key points

Factors are used to manage categorical data either sequentially (ordinal) or non-sequential (nominal)
It is done by calling the function 'factor(vektor)'
The 'levels()' function displays a list of unique categories recognized by factors
The parameter 'ordered = TRUE' is used to create a tiered category (e.g.: Low < While < High)

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