π‘ How do I merge two data.tables in R?
π‘ What's the best way to plot time series data in ggplot2?
π‘ Can you help me optimize this data.table operation?
π‘ How do I create a multi-panel plot using ggplot2?
π‘ How can I run the same funtion across multiple variables?
π‘ How do I create multiple variables?
π‘ How do I calculate the mean by a group?