摘要：
1 pkgs <- list("hflights", "doParallel", "foreach", "dplyr", "rbenchmark", "data.table") 2 lapply(pkgs, require, character.only = T) 3 4 data(hflights) 5 6 benchmark(replications = 10, orde... 阅读全文
摘要：
If your regression model contains a categorical predictor variable, you commonly test the significance of its categories against a preselected referen 阅读全文