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Reorder levels of a factor

/ Published in: R
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  1. # x is already a factor 
  2. levels(x) 
  3. # [1] "Large" "Medium" "Small" 
  4.  
  5. # various ways to reorder levels to be Small, Medium, Large 
  6. factor(x, levels = levels(x)[3:1]) 
  7. factor(x, levels = c("Small", "Medium", "Large")) 
  8.  
  9. # x is not yet a factor (e.g., a character vector or data.frame col) 
  10. factor(x, levels = levels(factor(x))[3:1]) 
  11. factor(x, levels = c("Small", "Medium", "Large"))

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