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November 17, 2016 20:00
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Create rollup/aggregate variables in the same dataset
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| install.packages("devtools") | |
| install.packages("dplyr") | |
| library("devtools") | |
| library("dplyr") | |
| install_github("RevolutionAnalytics/dplyrXdf") | |
| airline_demo_xdf_file <- file.path(rxGetOption("sampleDataDir"), "AirlineDemoSmall.xdf") | |
| airline <- RxXdfData(airline_demo_xdf_file) | |
| smry <- airline %>% group_by(DayOfWeek) %>% | |
| summarise(DayOfWeekMeans=mean(CRSDepTime), | |
| DayOfWeekStdDev=sd(CRSDepTime), | |
| DayOfWeekMin=min(CRSDepTime), | |
| DayOfWeekMax=max(CRSDepTime), | |
| DayOfWeekN=n()) | |
| airline_demo_with_summary <- left_join(airline, smry, by="DayOfWeek") | |
| head(airline_demo_with_summary) |
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