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[ÇóÖú] ggplot»æÍ¼£¬ÔõÑùÌí¼Ó²»Í¬·½·¨ÄâºÏµÄÇ÷ÊÆÏßµÄͼÀý£¿

ggplot»æÍ¼£¬´úÂëÈçÏ£¬·Ö±ðÓÃËÄÖÖ·½·¨ÄâºÏÁËÇ÷ÊÆÏߣ¬ÕâËĸöÇ÷ÊÆÏßµÄͼÀýÈçºÎÌí¼Ó£¿
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CODE:
ggplot(mtcars,aes(mpg,wt))+
  geom_point()+
  geom_smooth(method='lm',se=FALSE,show.legend=TRUE,
              linetype=1,color='black',size = 1)+
  geom_smooth(formula=y~poly(x,2),se=FALSE,show.legend=TRUE,
              linetype=2,color='blue',size=1.2)+
  geom_smooth(method='gam',se=FALSE,show.legend=TRUE,
              linetype=3,color='gold',size=1.5)+
  stat_function(fun = function(x) -0.08*x +5, linetype=4,
                show.legend=TRUE,size=2,color='red')

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