我现在希望有一个边框将这个图括起来(相当于增加一个x-axis和y-axis,但是不显示刻度和标签),应该怎么做,我的代码如下,多谢各位
- twoway (histogram pr_ratio_complex if $sample2015, width(2.5) color(eltblue*0.5)) ///
- (histogram pr_ratio_complex if $sample2010, width(2.5) ///
- fcolor(none) lcolor(black)) ///
- (kdensity pr_ratio_complex if $sample2015, lpattern(solid) lcolor(red) lwidth(medthick)) ///
- (kdensity pr_ratio_complex if $sample2010, lpattern(dash) lcolor(red) lwidth(medthick)) ///
- , ///
- xlabel(20(10)100, labsize(small)) ylabel(, angle(horizontal) labsize(small) format(%3.2f)) ///
- legend(order(1 "2015年北京样本" 2 "2010年北京样本" 3 "密度曲线-2015" 4 "密度曲线-2010") ///
- region(lcolor(white)) col(1) size(small) ring(0) pos(1)) ///
- title("Price-to-Rent ratio",size(medium)) ///
- ytitle("Density",size(medium)) graphregion(color(white)) plotregion(margin(0))


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