Created
March 8, 2025 02:34
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recursive lag function in tidyverse
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| library(tidyverse) | |
| # sample data | |
| data <- tibble( | |
| headcount=c(100,NA,NA) | |
| ,attrition=rep(.03,3) | |
| ,hiring=c(10,20,30) | |
| ) | |
| # solution | |
| data |> | |
| mutate( | |
| headcount=accumulate2(.x=attrition[-1],.y=hiring[-1],.f=\(prev,.x,.y){ | |
| out <- prev*(1-.x)+.y | |
| } | |
| ,.init=first(headcount) | |
| ) | |
| ) |
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