arrange by two factors...

R how to keep top levels and change all the other levels...

Count all observed factor levels, also those that aren't observed...

R: factor levels, recode rest to 'other'...

modification of code to bulk process in r...

Replacing levels of multiple factors...

Looping through levels of a factor and comparing one variable to another...

Rename levels of factors that contain symbols in R...

droplevels() messes with table() so as to produce wrong counts...

Remove rows where a level of a factor occurs only one time in a data.frame in R...

Consecutive value after and new level of factor in R...

split column into three columns based on the under score "_" in the levels...

Counting values within levels...

access second level of list...

R: "Binning" categorical variables...

Ghost factor levels in R...

Select row by level of a factor...

modify name and number of levels for factors within a list...

How to sort factor levels in a table output in R?...

Merging several factor variables...

Unspecified levels in factor()...

How to order levels in a variable based on both the sum of value in a variable and the levels in ano...

R: How to write a function that gets the levels of column in a data.table...

How to deal with overlapping factor levels? (e.g. when producing tables and plots)...

Unused factor levels not dropped after subsetting?...

Best way to make factor levels uniform over a number of data frames...

Shuffle/permute values within specific columns, for a specific factor level of group-variable...

R data frame factor levels...

How to continue to use factor where one level is missing (has been removed)?...

Reorder levels of factor names in data frame...