Thanks in advance for any guidance you may give. I would like to estimate the ratio (95%CI) of two (2) predicted probabilities that were computed using postestimation margins after logistic regression. I thought I could use nlcom but I`m coming stuck.
Code:
logit dm i.sex margins sex, post
PHP Code:
Logistic regression Number of obs = 4,830
LR chi2(1) = 7.04
Prob > chi2 = 0.0080
Log likelihood = -2596.4629 Pseudo R2 = 0.0014
------------------------------------------------------------------------------
dm | Coefficient Std. err. z P>|z| [95% conf. interval]
-------------+----------------------------------------------------------------
sex |
Male | -.1912397 .0725017 -2.64 0.008 -.3333405 -.049139
_cons | -1.14623 .0420583 -27.25 0.000 -1.228663 -1.063797
------------------------------------------------------------------------------
Code:
margins sex, post
PHP Code:
Expression: Pr(dm), predict()
------------------------------------------------------------------------------
| Delta-method
| Margin std. err. t P>|t| [95% conf. interval]
-------------+----------------------------------------------------------------
sex |
Female | 0.146 0.012 12.62 0.000 0.124 0.169
Male | 0.117 0.014 8.17 0.000 0.089 0.146
------------------------------------------------------------------------------
Code:
logit dm i.lclass
PHP Code:
Logistic regression Number of obs = 3,338
LR chi2(4) = 89.35
Prob > chi2 = 0.0000
Log likelihood = -1431.0752 Pseudo R2 = 0.0303
------------------------------------------------------------------------------
dm | Coefficient Std. err. z P>|z| [95% conf. interval]
-------------+----------------------------------------------------------------
lclass |
2 | .1144973 .1324727 0.86 0.387 -.1451444 .374139
3 | 1.012298 .181102 5.59 0.000 .6573448 1.367252
4 | -.6119494 .1525491 -4.01 0.000 -.9109402 -.3129587
5 | .3836895 .1778637 2.16 0.031 .0350831 .7322959
|
_cons | -1.662886 .1079938 -15.40 0.000 -1.87455 -1.451222
------------------------------------------------------------------------------
Code:
. margins lclass, post
PHP Code:
Expression: Pr(dm), predict()
------------------------------------------------------------------------------
| Delta-method
| Margin std. err. t P>|t| [95% conf. interval]
-------------+----------------------------------------------------------------
lclass |
1 | 0.078 0.023 3.47 0.001 0.034 0.123
2 | 0.044 0.010 4.46 0.000 0.025 0.064
3 | 0.213 0.052 4.08 0.000 0.111 0.316
4 | 0.051 0.039 1.30 0.196 -0.026 0.128
5 | 0.296 0.104 2.84 0.005 0.091 0.501
------------------------------------------------------------------------------
Code:
nlcom _b[Male.sex]\_b[1.lclass]
PHP Code:
[Male.sex]\_b[1.lclass] not found
Thanks,
Itai
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