"R table()"의 두 판 사이의 차이

93번째 줄: 93번째 줄:


==같이 보기==
==같이 보기==
{{z컬럼3|
* [[R xtabs()]]
* [[R xtabs()]]
* [[R ddply()]]
* [[R ddply()]]
* [[R factor()]]
* [[R factor()]]
* [[R ftable()]]
* [[R ftable()]]
* [[R unique()]]
* [[R is.table()]]
* [[R is.table()]]
* [[R as.table()]]
* [[R as.table()]]
105번째 줄: 107번째 줄:
* [[R margin.table()]]
* [[R margin.table()]]
* [[함수 array_count_values()]]
* [[함수 array_count_values()]]
}}


==참고==
==참고==

2020년 5월 5일 (화) 18:31 판

1 개요

R table()
벡터
x <- c(3,1,4,1,5,2,6,5)
table(x)
## x
## 1 2 3 4 5 6 
## 2 1 1 1 2 1
table( c(3,1,4,1,5,2,6,5) )
## 
## 1 2 3 4 5 6 
## 2 1 1 1 2 1
데이터프레임$컬럼
table(iris$Species)
##    setosa versicolor  virginica 
##        50         50         50
v <- c(1, 'hello', 1, 'world', 'hello')
table(v)
## v
##     1 hello world 
##     2     2     1
summary(warpbreaks)
##     breaks      wool   tension
## Min.   :10.00   A:27   L:18   
## 1st Qu.:18.25   B:27   M:18   
## Median :26.00          H:18   
## Mean   :28.15                 
## 3rd Qu.:34.00                 
## Max.   :70.00                 

table(warpbreaks$wool,warpbreaks$tension)
##  
##   L M H
## A 9 9 9
## B 9 9 9
scores <- read.table( header=TRUE, stringsAsFactors=FALSE, text="
Class  Name variable value
    A Alice  English    90
    A   Bob  English    80
    B  Dave  English    60
    A Alice     Math    60
    B Carol     Math    80
    B  Dave     Math    90
")
scores
##   Class  Name variable value
## 1     A Alice  English    90
## 2     A   Bob  English    80
## 3     B  Dave  English    60
## 4     A Alice     Math    60
## 5     B Carol     Math    80
## 6     B  Dave     Math    90

table( scores$variable )
## English    Math 
##       3       3 

table( scores$value )
## 60 80 90 
##  2  2  2
table()과 ddply()
library(plyr)
table(baseball[1:100,]$year)
##
## 1871 1872 1873 1874 1875 1876 1877 1878 
##    7   13   13   15   17   15   17    3
ddply(baseball[1:100,], ~year, nrow)
ddply(baseball[1:100,], 'year', nrow)
ddply(baseball[1:100,], .(year), nrow)
##   year V1
## 1 1871  7
## 2 1872 13
## 3 1873 13
## 4 1874 15
## 5 1875 17
## 6 1876 15
## 7 1877 17
## 8 1878  3

2 같이 보기

3 참고

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