Run the appropriate test to determine if year fixed effects are needed the regression written in Question 5.
What is the F-statistic on this test?
我写的是
xtreg dlngdp L1.lngdp lnsave lnhc lnn i.year
testparm i.year
但是运行出的数据里没有F-statistic,要用什么方法来确定回归中需不需要年份固定效应啊。