R tapply()

1 개요

R tapply()

df <- read.table("https://raw.githubusercontent.com/shifteight/R/master/TRB/data/daphnia.txt",
                 header=T)
head(df)
##   Growth.rate Water Detergent Daphnia
## 1    2.919086  Tyne    BrandA  Clone1
## 2    2.492904  Tyne    BrandA  Clone1
## 3    3.021804  Tyne    BrandA  Clone1
## 4    2.350874  Tyne    BrandA  Clone2
## 5    3.148174  Tyne    BrandA  Clone2
## 6    4.423853  Tyne    BrandA  Clone2

attach(df)
tapply(Growth.rate, Detergent, mean)
##   BrandA   BrandB   BrandC   BrandD 
## 3.884832 4.010044 3.954512 3.558231

2 같이 보기

• R by()
• R apply()
• R lapply()
• R sapply()
• R mapply()
• R ddply()
• R aggregate()
• R apply 패밀리

3 참고

• https://www.rdocumentation.org/packages/base/versions/3.6.0/topics/tapply