cshalizi + to_teach:statcomp + time_series   3

Christopher Gandrud (간드루드 크리스토파): Slide: one function for lag/lead variables in data frames, including time-series cross-sectional data
"I often want to quickly create a lag or lead variable in an R data frame. Sometimes I also want to create the lag or lead variable for different groups in a data frame, for example, if I want to lag GDP for each country in a data frame.
"I've found the various R methods for doing this hard to remember and usually need to look at old blog posts. Any time we find ourselves using the same series of codes over and over, it's probably time to put them into a function."

--- I think this might make a good exercise for statistical computing.
R  time_series  to_teach:statcomp 
july 2013 by cshalizi

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