Park questions

Park answers

• Check if the value exists in any other columns with Tidyverse
• How to rename columns in R with dplyr using a character object?
• Create sequence of date on every last day of month
• Keep only the second observation per group in R
• Keeping 2 digits after decimal without rounding off [duplicate]
• How to minimize the white space created by the guide_area() function of the patchwork package in plots made with ggplot2?
• How to find which groups have identical values in a specific column using dplyr?
• If two values in the same column match, return value from the same row from another column
• In R, what's the average number of repeated column values per ID?
• Ranking duplicated rows in R [duplicate]