Wrangle data from long to wide format for cox regression in R...

How can I pivot wider and transform my data frame?...

How to subtract rows between two different dataframes and replace original value?...

Label day timing into morning, afternoon and evening in R...

mutate specific columns with tidyverse...

Unpack json columns into a dataframe...

Wrangle dataframe in R, possibly with dcast...

How can I calculate time duration for given time points in R...

Is there an R function that can convert a existing metric into a new logical metric?...

How do you add a column to data frames in a list?...

I want to make tidy data...

Split dataframe into list based on identical consecutive element...

In DataPrep, sum a set of many columns or values in an object...