add factor levels that are not in use...

Idiomatic method of finding the median of an ordinal...

One of the factor's levels is an empty string; how to replace it with non-missing value?...

Confused about two dimensional factor in R...

Problem with factor and reordering facet_grid...

ggplot2 y-axis order changes after subsetting...

How can I compare two factors with different levels?...

Relative and cumulative percentages for levels of an ordered factor variable in R...

Replacing numbers within a range with a factor...

Unseen factor levels when appending new records with unseen string values to a dataframe, cause Warn...

How to treat a variable as random factor in GLM in R...

in R, how to set and retain custom levels in factor with different labels?...

How to count factors frequency and organize in a new dataframe in R...

read.csv parameter stringsAsFactors not working?...

Why doesn't rle accept a factor as input?...

Does extractPrediction() support factors?...

Simple Rcpp function with try catch returning 'memory not mapped' error...

How to fill NAs with LOCF by factors in data frame, split by country...

how to convert factor column into date in data frame in r...

R how to change one of the level to NA...

Why use as.factor() instead of just factor()...

How to output all levels, which length is not equal to 3?...

Level sets of factors are different while calculating accuracy...

Levels in R with conditions on time...

R considers factor name as a level...

Defining the levels of dataframe columns in R...

Generate table with proportions of success vs failure...

R Checking if data table values are same level...

arrange by two factors...

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