横放的话年份可能互相覆盖！

您好，请问什么叫横放，具体的回归命令怎样输入，谢谢！

add an option "xlabel(#10)"?

http://www.ats.ucla.edu/stat/stata/library/GraphExamples/code/markerlabel3.htm

看看这里的图的x州是怎么设置的
sysuse lifeexp, clear
keep if region==2 | region==3
replace gnppc = gnppc / 1000
label var gnppc "GNP per capita (thousands of dollars)"
gen lgnp = log(gnp)
qui reg lexp lgnp
predict hat
label var hat "Linear prediction"
replace country = "Trinidad" if country=="Trinidad and Tobago"
replace country = "Para" if country == "Paraguay"
gen pos = 3
replace pos = 9 if lexp > hat
replace pos = 3 if country == "Colombia"
replace pos = 3 if country == "Para"
replace pos = 3 if country == "Trinidad"
replace pos = 9 if country == "United States"

#delimit ;

twoway
(scatter lexp gnppc, mlabel(country) mlabv(pos))
(line hat gnppc, sort)
, xsca(log)   
   xlabel(.5 5 10 15 20 25 30, grid)  
   legend(off)
  title("Life expectancy vs. GNP per capita")
  subtitle("North, Central, and South America")
  note("Data source:  World bank, 1998")
  ytitle("Life expectancy at birth (years)")
;
#delimit cr

太感谢你了，问题解决的感觉真好！嘻嘻~~