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| 开心 2020-2-18 13:47:31 |
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签到天数: 78 天 连续签到: 1 天 [LV.6]常住居民II
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10论坛币
1.想做的是租售同权政策对学区房的研究 拿了一个区域的二手交易数据做PSMDID 然后现在的问题是房屋的特征有很多是分类变量,比如几室几厅、朝向等,如果做出虚拟变量的话就会有很多很多个,最后做出psm变成了这样,求问应该怎么处理如几十几厅这种有20类的变量)!
. diff saleprice,tr(d) p(t) id(district) k cov(layer area distance fit1 fit2 f
> it3 fac1 fac2 fac3 fac4 fac5 fac6 fac7 fac8 fac9 fac10 fac11 fac12 bud1 bud2
> bud3 ty1 ty2 ty3 ty4 ty5 ty6 ty7 ty8 ty9 ty10 ty11 ty12 ty13 ty14 ty15 ty16
> ty17 ty18 ty19 ty20) rep log sup test
Report - Propensity score estimation with logit command
Atention: _pscore is estimated at baseline
note: ty1 != 0 predicts failure perfectly
ty1 dropped and 1 obs not used
note: ty4 != 0 predicts failure perfectly
ty4 dropped and 4 obs not used
note: ty5 != 0 predicts success perfectly
ty5 dropped and 1 obs not used
note: ty12 != 0 predicts success perfectly
ty12 dropped and 1 obs not used
note: ty13 != 0 predicts failure perfectly
ty13 dropped and 6 obs not used
note: ty18 != 0 predicts failure perfectly
ty18 dropped and 2 obs not used
note: ty20 != 0 predicts failure perfectly
ty20 dropped and 1 obs not used
note: fit3 dropped because of collinearity
note: fac4 dropped because of collinearity
note: fac10 dropped because of collinearity
note: bud2 dropped because of collinearity
note: bud3 dropped because of collinearity
note: ty8 dropped because of collinearity
note: ty11 dropped because of collinearity
note: ty15 dropped because of collinearity
note: ty19 dropped because of collinearity
Iteration 0: log likelihood = -327.58016
Iteration 1: log likelihood = -309.68541
Iteration 2: log likelihood = -305.72193
Iteration 3: log likelihood = -303.30688
Iteration 4: log likelihood = -302.84723
Iteration 5: log likelihood = -302.80129
Iteration 6: log likelihood = -302.80124
Logistic regression Number of obs = 1024
LR chi2(25) = 49.56
Prob > chi2 = 0.0024
Log likelihood = -302.80124 Pseudo R2 = 0.0756
------------------------------------------------------------------------------
d | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
layer | .013826 .0148255 0.93 0.351 -.0152314 .0428834
area | .0035187 .0067148 0.52 0.600 -.009642 .0166795
distance | -.0003911 .0002221 -1.76 0.078 -.0008264 .0000442
fit1 | .4668567 .5037281 0.93 0.354 -.5204323 1.454146
fit2 | .5214091 .5189723 1.00 0.315 -.4957578 1.538576
fac1 | -.9002936 .7596992 -1.19 0.236 -2.389277 .5886895
fac2 | -.1183306 .7037523 -0.17 0.866 -1.49766 1.260999
fac3 | -.7663603 .7479054 -1.02 0.306 -2.232228 .6995073
fac5 | -.8653024 .7372475 -1.17 0.241 -2.310281 .5796761
fac6 | -.8439366 .6890913 -1.22 0.221 -2.194531 .5066574
fac7 | -1.095508 .7292878 -1.50 0.133 -2.524886 .3338699
fac8 | -1.927912 .9802947 -1.97 0.049 -3.849254 -.0065694
fac9 | -1.509873 .9838098 -1.53 0.125 -3.438105 .4183588
fac11 | -.9444449 .8931755 -1.06 0.290 -2.695037 .8061469
fac12 | -.4224127 .7602739 -0.56 0.578 -1.912522 1.067697
bud1 | -1.32147 .3279392 -4.03 0.000 -1.964219 -.6787212
ty2 | -3.159524 1.814983 -1.74 0.082 -6.716824 .3977767
ty3 | -1.579068 1.498144 -1.05 0.292 -4.515376 1.35724
ty6 | -2.205359 1.463701 -1.51 0.132 -5.074161 .6634419
ty7 | -2.581226 1.502027 -1.72 0.086 -5.525145 .3626937
ty9 | -1.864168 1.468457 -1.27 0.204 -4.742291 1.013955
ty10 | -2.214801 1.475838 -1.50 0.133 -5.107391 .6777892
ty14 | -1.493533 1.577886 -0.95 0.344 -4.586132 1.599066
ty16 | -2.01442 1.996657 -1.01 0.313 -5.927795 1.898956
ty17 | -.7865311 2.094981 -0.38 0.707 -4.892618 3.319556
_cons | 1.292582 1.773997 0.73 0.466 -2.184389 4.769553
------------------------------------------------------------------------------
Matching iterations...
..............................................................................
> .....................
TWO-SAMPLE T TEST
Test on common support
Number of observations (baseline): 1048
Before After
Control: 946 - 946
Treated: 102 - 102
1048 -
t-test at period = 0:
------------------------------------------------------------------------------
> ----------------
Weighted Variable(s) | Mean Control | Mean Treated | Diff. | |t|
> | Pr(|T|>|t|)
---------------------+------------------+--------------+------------+---------
> +---------------
saleprice | 3.1e+04 | 4.0e+04 | 9668.978 | 13.66
> | 0.0000***
layer | 8.021 | 8.538 | 0.518 | 0.92
> | 0.3564
area | 72.320 | 74.154 | 1.834 | 0.86
> | 0.3879
distance | 712.128 | 702.758 | -9.371 | 0.31
> | 0.7548
fit1 | 0.641 | 0.626 | -0.014 | 0.47
> | 0.6386
fit2 | 0.303 | 0.323 | 0.020 | 0.69
> | 0.4893
fit3 | 0.057 | 0.051 | -0.006 | 0.42
> | 0.6752
fac1 | 0.089 | 0.081 | -0.008 | 0.47
> | 0.6404
fac2 | 0.168 | 0.182 | 0.014 | 0.58
> | 0.5640
fac3 | 0.089 | 0.091 | 0.002 | 0.13
> | 0.9005
fac4 | 0.026 | 0.030 | 0.004 | 0.42
> | 0.6772
fac5 | 0.097 | 0.101 | 0.005 | 0.24
> | 0.8130
fac6 | 0.257 | 0.253 | -0.004 | 0.16
> | 0.8745
fac7 | 0.126 | 0.111 | -0.015 | 0.74
> | 0.4587
fac8 | 0.023 | 0.020 | -0.003 | 0.28
> | 0.7776
fac9 | 0.025 | 0.020 | -0.005 | 0.48
> | 0.6306
fac10 | 0.000 | 0.000 | 0.000 | .
> | .
fac11 | 0.033 | 0.030 | -0.002 | 0.22
> | 0.8285
fac12 | 0.068 | 0.081 | 0.012 | 0.74
> | 0.4588
bud1 | 0.812 | 0.818 | 0.006 | 0.24
> | 0.8120
bud2 | 0.000 | 0.000 | 0.000 | .
> | .
bud3 | 0.188 | 0.182 | -0.006 | 0.24
> | 0.8120
ty1 | 0.000 | 0.000 | 0.000 | .
> | .
ty2 | 0.010 | 0.010 | 0.000 | 0.05
> | 0.9610
ty3 | 0.171 | 0.182 | 0.011 | 0.46
> | 0.6470
ty4 | 0.000 | 0.000 | 0.000 | .
> | .
ty5 | 0.000 | 0.000 | 0.000 | .
> | .
ty6 | 0.382 | 0.354 | -0.028 | 0.91
> | 0.3621
ty7 | 0.085 | 0.071 | -0.015 | 0.86
> | 0.3919
ty8 | 0.000 | 0.000 | 0.000 | .
> | .
ty9 | 0.145 | 0.172 | 0.026 | 1.13
> | 0.2575
ty10 | 0.144 | 0.141 | -0.002 | 0.10
> | 0.9178
ty11 | 0.014 | 0.000 | -0.014 | 2.66
> | 0.0080***
ty12 | 0.000 | 0.000 | 0.000 | .
> | .
ty13 | 0.000 | 0.000 | 0.000 | .
> | .
ty14 | 0.034 | 0.051 | 0.017 | 1.33
> | 0.1851
ty15 | 0.000 | 0.000 | 0.000 | .
> | .
ty16 | 0.010 | 0.010 | -0.000 | 0.05
> | 0.9569
ty17 | 0.005 | 0.010 | 0.005 | 0.84
> | 0.3999
ty18 | 0.000 | 0.000 | 0.000 | .
> | .
ty19 | 0.000 | 0.000 | 0.000 | .
> | .
ty20 | 0.000 | 0.000 | 0.000 | .
> | .
------------------------------------------------------------------------------
> ----------------
*** p<0.01; ** p<0.05; * p<0.1
Attention: option kernel weighs variables in cov(varlist)
Means and t-test are estimated by linear regression
.
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