Re: [R] Lag in dataframe

2014-05-12 Thread arun
Hi, May be this helps: dat1 <- structure(list(ID_CASE = c("CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0026A", "CS0191C", "CS0191C", "CS0191C", "CS0191C", "CS0191C", "CS0191C",

[R] Lag in dataframe

2014-05-12 Thread Abhinaba Roy
Hi R helpers, I have a dataframe as, ID_CASE Month CS0026A 201301 CS0026A 201302 CS0026A 201303 CS0026A 201304 CS0026A 201305 CS0026A 201306 CS0026A 201307 CS0026A 201308 CS0026A 201309 CS0026A 201310 CS0191C 201302 CS0191C 201303 CS0191C 20