请教一下各位老师,我在做空间面板模拟范例时用的是 xsmle ,下载范例时看不见usaww矩阵文件,模拟也老是出错,不知道怎么解决?谢谢!!
. use "D:\stata11\ado\personal\product.dta", clear
. xtset state year
panel variable: state (strongly balanced)
time variable: year, 1970 to 1974
delta: 1 unit
. xsmle pcap hwy water util pc gsp emp unemp,wmat(usaww)
usaww is not a valid spmat object
r(498);