8.1 통계치 계산하기

먼저 Y축에 표시될 자동차 유형별 고속도로 연비의 평균을 구해 보겠습니다.

library(tidyverse)

## Warning: package 'tidyverse' was built under R version 4.0.5

## -- Attaching packages --------------------------------------- tidyverse 1.3.1 --

## v tidyr   1.1.3     v dplyr   1.0.5
## v readr   1.4.0     v stringr 1.4.0
## v purrr   0.3.4     v forcats 0.5.1

## -- Conflicts ------------------------------------------ tidyverse_conflicts() --
## x dplyr::filter() masks stats::filter()
## x dplyr::lag()    masks stats::lag()
## x dplyr::recode() masks car::recode()
## x dplyr::select() masks MASS::select()
## x purrr::some()   masks car::some()

library(MASS)

dd <- Cars93 %>% 
         group_by(Type) %>% 
         summarise(MPG.mean = mean(MPG.highway))
dd

## # A tibble: 6 x 2
##   Type    MPG.mean
##   <fct>      <dbl>
## 1 Compact     29.9
## 2 Large       26.7
## 3 Midsize     26.7
## 4 Small       35.5
## 5 Sporty      28.8
## 6 Van         21.9

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