adf.test(x[c(300000:500000),2])
结果是：Augmented Dickey-Fuller Test
data: x[c(3e+05:5e+05), 2]
Dickey-Fuller = -21.52, Lag order = 58, p-value = 0.01
alternative hypothesis: stationary
Warning message:
In adf.test(x[c(3e+05:5e+05), 2]) : p-value smaller than printed p-value
当用pp.test(x[c(300000:500000),2])却是下面的错误，大家帮忙解释下谢谢
Error in if (interpol == min(tablep)) warning("p-value smaller than printed p-value") else warning("p-value greater than printed p-value") :
missing value where TRUE/FALSE needed
In addition: Warning messages:
1: In sum(yt1 * (1:n)) : integer overflow - use sum(as.numeric(.))
2: In sum(yt1 * (1:n)) : integer overflow - use sum(as.numeric(.))
