stata小白，两个问题，请教一下
1.estimation result m1 not found是什么原因呀
2.
gen tradesharexlnyearsschool=tradeshare*lnyearsschool
reg growth tradeshare lnyearsschool rev_coups assasinations lnrgdp60 tradesharexlnyearsschool,r
est store m4
gen tradeshare2 = tradeshare^2
gen tradeshare3 = tradeshare*tradeshare*tradeshare
reg growth tradeshare tradeshare2 tradeshare3 lnyearsschool rev_coups assasinations lnrgdp60,r
est store m5
esttab m1 m2 m3 m4 m5 using 7.rtf,se r2 ar2(4)
tw sc growth yearsschool
test (tradesharexlnyearsschool=0)
logout, save (8) word replace: test (tradesharexlnyearsschool=0)
test (tradeshare2=0)(tradeshare3=0)
logout, save (9) word replace: test (tradeshare2=0)(tradeshare3=0)
截取了部分代码，运行后显示
. test (tradesharexlnyearsschool=0)
tradesharexlnyearsschool not found
r(111);