我是STATA的新手,就xtlogit的几个初级问题请教各位高人,主要是如何理解xtlogit的运行结果。为了便于说明问题,我通过一个实例来说明我的问题:
xtlogit depressd group visit, i(subj) re
部分结果如下:
Random-effects logit Number of obs = 295
Group variable (i) : subj Number of groups = 61
Random effects u_i ~ Gaussian Obs per group: min = 1
avg = 4.8
max = 6
Wald chi2(2) = 34.43
Log likelihood = -134.03699 Prob > chi2 = 0.0000
------------------------------------------------------------------------------
depressd | Coef. Std. Err. z P>|z| [95% Conf. Interval]
---------+--------------------------------------------------------------------
group | -3.178 1.163589 -2.731 0.006 -5.458593 -.8974064
visit | -.7714922 .1368503 -5.637 0.000 -1.039714 -.5032706
_cons | 4.785998 1.193686 4.009 0.000 2.446417 7.125579
---------+--------------------------------------------------------------------
/lnsig2u | 1.875076 .4041385 4.640 0.000 1.082979 2.667173
---------+--------------------------------------------------------------------
sigma_u | 2.553687 .5160215 1.718565 3.794629
rho | .6646819 .0900743 .4730591 .8140169
------------------------------------------------------------------------------
Likelihood ratio test of rho=0: chi2(1) = 70.87 Prob > chi2 = 0.0000
我的问题是:
计算“/lnsig2u”目的是什么? 计算“rho”目的是什么?十分感谢!
Random-effects logit Number of obs = 295
Group variable (i) : subj Number of groups = 61
Random effects u_i ~ Gaussian Obs per group: min = 1
avg = 4.8
max = 6
Wald chi2(2) = 34.43
Log likelihood = -134.03699 Prob > chi2 = 0.0000
------------------------------------------------------------------------------
depressd | Coef. Std. Err. z P>|z| [95% Conf. Interval]
---------+--------------------------------------------------------------------
group | -3.178 1.163589 -2.731 0.006 -5.458593 -.8974064
visit | -.7714922 .1368503 -5.637 0.000 -1.039714 -.5032706
_cons | 4.785998 1.193686 4.009 0.000 2.446417 7.125579
---------+--------------------------------------------------------------------
/lnsig2u | 1.875076 .4041385 4.640 0.000 1.082979 2.667173
---------+--------------------------------------------------------------------
sigma_u | 2.553687 .5160215 1.718565 3.794629
rho | .6646819 .0900743 .4730591 .8140169
------------------------------------------------------------------------------
Likelihood ratio test of rho=0: chi2(1) = 70.87 Prob > chi2 = 0.0000
我的问题是:
计算“/lnsig2u”目的是什么? 计算“rho”目的是什么?十分感谢!
[此贴子已经被作者于2008-3-11 20:39:50编辑过]