payton数据之旅

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