多期DID平行趋势检验

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按照连老师的命令，做多期did平行趋势检验，但是图中并没有t期，这是哪里出了问题？还请各位大神帮忙解答。连老师给出的命令如下：

gen policy = wrkyr - branch_reform
replace policy = -5 if policy <= -5
replace policy = 10 if policy >= 10
gen policy_d = policy + 5
gen y = log(gini)
xtreg y ib5.policy_d i.wrkyr, fe r ///生成前五期系数均值
forvalues i = 0/4{
gen b_`i' = _b[`i'.policy_d]
}
gen avg_coef = (b_0+b_4+b_3+b_2+b_1)/5
su avg_coef
coefplot, baselevels ///
drop(*.wrkyr _cons policy_d) ///
coeflabels(0.policy_d = "t-5" ///
1.policy_d = "t-4" ///
2.policy_d = "t-3" ///
3.policy_d = "t-2" ///
4.policy_d = "t-1" ///
5.policy_d = "t" ///
6.policy_d = "t+1" ///
7.policy_d = "t+2" ///
8.policy_d = "t+3" ///
9.policy_d = "t+4" ///
10.policy_d = "t+5" ///
11.policy_d = "t+6" ///
12.policy_d = "t+7" ///
13.policy_d = "t+8" ///
14.policy_d = "t+9" ///
15.policy_d = "t+10") ///更改系数的label
vertical ///转置图形
yline(0, lwidth(vthin) lpattern(dash) lcolor(teal)) ///加入y=0这条虚线
ylabel(-0.06(0.02)0.06) ///
xline(6, lwidth(vthin) lpattern(dash) lcolor(teal)) ///
ytitle("Percentage Changes", size(small)) ///加入Y轴标题,大小small
xtitle("Years relative to branch deregulation", size(small)) ///加入X轴标题，大小small
transform(*=@-r(mean)) ///去除前五期的系数均值
addplot(line @b @at) ///增加点之间的连线
ciopts(lpattern(dash) recast(rcap) msize(medium)) ///CI为虚线上下封口
msymbol(circle_hollow) ///plot空心格式
scheme(s1mono)

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关键词：DID Deregulation percentage Regulation forvalues

gen y = log(gini)请问这个是什么意思