R and factor coding in formula...

subsetting based on number of observations in a factor variable...

Add a factor column to quantmod/xts...

Remove rows based on factor-levels...

R multiple file "split and plot"...

R summing factors...

Exclude one factor level interaction calculation in lme4...

How do I drop a factor level with no observations?...

Recoding dummy variable to ordered factor...

Use qplot to draw only one subset of data...

Generate a dichotomous variable from a factor...

R large data frame with factors won't shrink when subset...

Getting Factor Means into the dataset after calculation...

Read data frame of factors (in R)...

How to make a factor a numeric value?...

How to call the factor level of a variable for each observation, and use those values to create a ne...

Order factor levels in order of appearance in data set...

R - ordering a barplot/histogram generated from a data frame...

Create factor based on multiple column values...

How do I append an int vector to a factor?...

R - using a for loop to modify a column in a data frame (and using factor levels)...

Error: Continuous value supplied to discrete scale with factor...

How to convert factor format to numeric format in R without changing the values?...

how to convert rows into factors in R?...

Creating factor variables from levels of other factor variables with if statement...

R factor values changing...

Adjust factors in dataset with dynamic preceding zero's...

R: Doing calculations on multiple factors/levels (Dummy variables)...

Remove some factor-interaction terms from estimation...

Selecting one column of a data frame returns a factor, instead of another data frame...