请问安慰剂检验中这段画图代码有什么错吗?stata一直报错。twoway (kdensity coef1) (scatter pvalue1 coef1, msymbol(smcircle_hollow) mcolor(blue)),
title("Placebo Test")
xlabel(-0.4(0.1)0.4) ylabel(,angle(0))
xline(-0.171, lwidth(vthin) lp(shortdash)) xtitle("Coefficients")
yline(0.1,lwidth(vthin) lp(dash)) ytitle(p value)
legend(label(1 "kdensity of estimates") label( 2 "p value"))
plotregion(style(none))
graphregion(color(white))


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