固定模型中考虑时间效应，双向固定效应-经管之家官网！

大家好，非常感谢能看我的帖子，我的数据是面板，十年，35个unit，数据基本是宏观层面的，所以想去除时间趋势来看一下回归结果，所以要做一个双向固定回归（tow-way FE)
code
tab year,gen(year)
增加了时间dummy后，回归中放入了year2-year10的时间dummy
但是我的回归结果中时间dummy都被omitted了，情况下方
note: yr2 omitted because of collinearity
note: yr3 omitted because of collinearity
note: yr4 omitted because of collinearity
note: yr5 omitted because of collinearity
note: yr6 omitted because of collinearity
note: yr7 omitted because of collinearity
note: yr8 omitted because of collinearity
note: yr9 omitted because of collinearity
note: yr10 omitted because of collinearity
这是我整个模型的回归
xtreg construction_area degree population salary residence_price residence_sales_area landtransferrin
> gfees yr2-year10,fe r
variables out of order
r(111);
. xtreg construction_area degree population salary residence_price residence_sales_area landtransferrin
> gfees yr2-yr10,fe
note: yr2 omitted because of collinearity
note: yr3 omitted because of collinearity
note: yr4 omitted because of collinearity
note: yr5 omitted because of collinearity
note: yr6 omitted because of collinearity
note: yr7 omitted because of collinearity
note: yr8 omitted because of collinearity
note: yr9 omitted because of collinearity
note: yr10 omitted because of collinearity
Fixed-effects (within) regression Number of obs = 350
Group variable: year Number of groups= 10
R-sq: Obs per group:
within= 0.8908 min = 35
between = 0.9640 avg = 35.0
overall = 0.8947 max = 35
F(6,334) = 454.09
corr(u_i, Xb)= 0.3527 Prob > F = 0.0000
--------------------------------------------------------------------------------------
construction_area | Coef. Std. Err. t P>|t| [95% Conf. Interval]
---------------------+----------------------------------------------------------------
degree | .0091235 .0021393 4.26 0.000 .0049152 .0133317
population | .1887304 .0326335 5.78 0.000 .1245373 .2529235
salary | .4310071 .105313 4.09 0.000 .2238467 .6381675
residence_price |-.0397967 .0545775 -0.73 0.466 -.1471558 .0675623
residence_sales_area | .5488597 .0332738 16.50 0.000 .483407 .6143124
landtransferringfees | .0988654 .0169302 5.84 0.000 .0655622 .1321686
yr2 | 0(omitted)
yr3 | 0(omitted)
yr4 | 0(omitted)
yr5 | 0(omitted)
yr6 | 0(omitted)
yr7 | 0(omitted)
yr8 | 0(omitted)
yr9 | 0(omitted)
yr10 | 0(omitted)
_cons |-.3585417 .3806528 -0.94 0.347 -1.107321 .3902373
---------------------+----------------------------------------------------------------
sigma_u |.06311328
sigma_e |.09674115
rho |.29854932 (fraction of variance due to u_i)
--------------------------------------------------------------------------------------
F test that all u_i=0: F(9, 334) = 4.86 Prob > F = 0.0000
我的数据都已经取了log，不知道这会不会是导致这个问题的原因，还行大家帮忙