Split/melt data...

summarizing data based on a pre-set condition and adding a (0,1) flag...

Summarise and lm model error...

How to count all unique values in a data.frame...

Proportion by subset within columns...

Include an additional column with aggregate()...

list of lists into data.frame in R efficiently...

Defining a range of values for ddply {plyr} to use when making combinations...

Count in plyr not working, returns "wrong result size (3), expected 8 or 1"...

I have a mapply function that works - how do I convert this to a mlply?...

Get counts of categorical factors across multiple variables/columns in R...

Merging two dataframes with unequal numbers of rows by two columns names...

plyr's rename() working in R Studio if run manually, but not in source(), or native R client...

Adding selected data frames together, from a list of data frames...

Different sample number for each group in a data set...

Running stats in R...

Calculate relative frequence of variable within dataframe in r...

How can I replace hyphen "cells" in R data frames with zeros?...

Joining columns from a data frame to another on conditions/WHERE...

Column math on wide data produced by dcast...

R plyr application to fill in missing values...

Only Keep Certain Combinations of Predictors in a Dataframe...

R: Find max value for column among a subset of a data frame...

plyr outperforms dplyr and data.table - What's wrong?...

Apply lm across dataframe by factor...

Importing multiple .csv files into R based on a list...

How to merge 2 data frames filling out missing values in R?...

R plyr summarize chunks...

Lagged differences...

Error when calculating values greater than 95% quantile using plyr...