本人在用ggplot画多维箱线图，遇到了如图所示的问题 我想按照three days，three weeks，three months这个顺序进行排列，但是画出来后，默认的就是three days，three months，three weeks，请问该怎么修改啊？如果是lable2是F1，F2，F3的话，这个顺序就不会打乱，求大神们赐教
lable1=rbind(b1,b2,b3,b4,b5,b6,b7)
lable2=c("three days","three weeks","three months")
#lable2=c("F1","F2","F3")
data= structure( data,.Dimnames=list( c(lable1),c(lable2)))
data=data[-301:-400,]
data.df=melt(data)
data.df = rename(data.df, c(X1="lable1",X2="lable2"))
library(ggplot2)
#基函数
  p=ggplot(data.df,aes(x=lable2, y=value))+
  #箱线图函数
  geom_boxplot(notch = TRUE,aes(fill=lable1)) +
  #颜色标尺
  scale_fill_brewer(palette = "Set3")+
  labs(x = "scenario",y = "Variability")
p=p + theme(axis.text.x = element_text(size = 14, color = "black"),axis.text.y = element_text(size = 14, color = "black"))
p+theme(axis.title.x = element_text(size = 16),axis.title.y = element_text(size = 16))