期中考

Statistic <- c(68,85,74,88,63,78,90,80,58,63)

Math <- c(85,91,74,100,82,84,78,100,51,70)

plot(Statistic,Math,
     pch = 17,
     col= "skyblue",
     main ="成績表",
     xlab ="統計成績",
     ylab ="數學成績")

hist(Math,
     col= "lightyellow",
     main ="數學成績",
     xlab ="數學成績",
     ylab ="個數")

# Load ggplot2
library(ggplot2)
# Load ggplot2
library(ggplot2)

# Create data
data <- data.frame(
  name=c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動") ,  
  value=c(185,82,36,28,25)
  )

# Barplot
ggplot(data, aes(x=name, y=value)) + 
  geom_bar(stat = "identity", width=0.2,  fill="#858ED1") 

data<- c(185,82,36,28,25)
labels <- c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動")

pie(data,labels,main ="學生的比例", col=heat.colors(length(data)))

# Library
library(tidyverse)

## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
## ✔ dplyr     1.1.4     ✔ readr     2.1.5
## ✔ forcats   1.0.0     ✔ stringr   1.5.1
## ✔ lubridate 1.9.4     ✔ tibble    3.2.1
## ✔ purrr     1.0.4     ✔ tidyr     1.3.1
## ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
## ✖ dplyr::filter() masks stats::filter()
## ✖ dplyr::lag()    masks stats::lag()
## ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors

# Create data
data <- data.frame(
  name= c("娛樂休閒","知識閱讀","體育競技","科學創新","公益活動"),
  value= c(185,82,36,28,25)
)
 
# plot
ggplot(data, aes(x=name, y=value)) +
  geom_segment( aes(x=name, xend=name, y=0, yend=value)) +
  geom_point( size=5, color="blue", fill=alpha("#858ED1", 0.3), alpha=0.7, shape=21, stroke=2) 

Date <- read.csv("D:/table1_1.csv")

stem(Date$Japanese)

## 
##   The decimal point is 1 digit(s) to the right of the |
## 
##   4 | 9
##   5 | 139
##   6 | 13
##   7 | 9
##   8 | 49
##   9 | 1

mean(Date$Japanese)

## [1] 67.9

median(Date$Japanese)

## [1] 62

as.numeric(names(table(Date$Japanese)))[which.max(table(Date$Japanese))]

## [1] 49

sd(Date$Japanese)

## [1] 16.25115

var(Date$Japanese)

## [1] 264.1

 quantile(Date$Japanese, 1 / 4)

##  25% 
## 54.5

 quantile(Date$Japanese, 3 / 4)

##   75% 
## 82.75