>RE::VISION CRM

R 데이터 분석

# MERGE 연습

YONG_X 2015. 6. 26. 10:46

# MERGE 연습


rcrashes3 <- merge(crashes, roads, by="Road", all = TRUE)

nrow(rcrashes3)


rcrashes4 <- merge(crashes, roads,  by="Road")

nrow(rcrashes4)



roads1 <- roads

names(roads1)[1] <- "roadname"


rcrashes5 <- merge(crashes, roads1, by.x = "Road", by.y = "roadname")