stata自己的命令就可以检验啊
Title
    [XT] xtunitroot -- Panel-data unit-root tests
Syntax
    Levin-Lin-Chu test
        xtunitroot llc varname [if] [in] [, LLC_options]
    Harris-Tzavalis test
        xtunitroot ht varname [if] [in] [, HT_options]
    Breitung test
        xtunitroot breitung varname [if] [in] [, Breitung_options]
    Im-Pesaran-Shin test
        xtunitroot ips varname [if] [in] [, IPS_options]
    Fisher-type tests (combining p-values)
        xtunitroot fisher varname [if] [in], {dfuller | pperron} lags(#) [Fisher_options]
    Hadri Lagrange multiplier stationarity test
        xtunitroot hadri varname [if] [in] [, Hadri_options]