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library(ggplot2)
data<-read.csv('E:/R2-2.1.csv')
ggplot(data,aes(x=bwt,fill=factor(smoke)))+
geom_histogram(binwidth=400,color='black',position='dodge')+
ggtitle('R2-02')+
xlab('birth weight')+
scale_fill_discrete(labels=c('No','Yes'))
ggplot(diamonds,aes(x=carat,color=color))+
geom_line(stat="density")+
xlab("price")+
ggtitle("R2-02")+
theme_bw()
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