代码为：<br>
tsset date<br>
dfuller R,trend<br>
varsoc R,maxlag(8)<br>
reg R L(1/3).R<br>
estat archlm,lags(1/20)<br>
arch R L(1/3).R,arch(1) garch(1) het(good1 bad1)
运行以后stata提示：<br>
could not calculate numerical derivatives<br>
discontinuous region with missing values encountered<br>
下附上数据和运行代码，跪求各位大神指教，求求了