!i=325
for !i=325 to 424
load C:\Users\Administrator\Desktop\a
series ly=log(y)
series r=ly-ly(-1)
sample s0 !i-325+3 !i
sample s1 !i-325+4 !i

运行到这里出现   error in sample：range error in “sample s0 325-325+3 !i”

哪位大侠指点一下？如何修改