graph twoway scatter,Cscatter-brain

preserve // 第一种方式绘制断点回归图 twoway (rarea upfit down
total = -maletotal/1e 6replace femtotal = femtotal/1e 6twoway
graph /scatterplot(bivar)=reptwt with measwt.
twoway scatter lower high, by(frequency, total yrescale)
stata:断点回归分析设计