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7.Case control, influential obs, model selection-1

7.Case control, influential obs, model selection-1 -...

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4L 5GIGI !4F5G *+, 562"78 9:++ !D -(A7"8?% 9Vq . use "/Users/barb/Documents/Biostat/Class/513/513-2011/Data/lowbw.dta", clear . cs low smoke, or | Mother's smoking during| | pregnancy | | Exposed Unexposed | Total -----------------+------------------------+------------ Cases | 30 29 | 59 Noncases | 44 86 | 130 -----------------+------------------------+------------ Total | 74 115 | 189 | | Risk | .4054054 .2521739 | .3121693 | | | Point estimate | [95% Conf. Interval] |------------------------+------------------------ Risk difference | .1532315 | .0160718 .2903912 Risk ratio | 1.607642 | 1.057812 2.443262 Attr. frac. ex. | .377971 | .0546528 .5907112 Attr. frac. pop | .1921887 | Odds ratio | 2.021944 | 1.084529 3.770602 (Cornfield) +------------------------------------------------- chi2(1) = 4.92 Pr>chi2 = 0.0265 4L 5GIGI !4F5G *+, 562"78 9:++ !D -(A7"8?% 9Vr . logistic low smoke Logistic regression Number of obs = 189 LR chi2(1) = 4.87 Prob > chi2 = 0.0274 Log likelihood = -114.9023 Pseudo R2 = 0.0207 ------------------------------------------------------------------------------ low | Odds Ratio Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- smoke | 2.021944 .6462989 2.20 0.028 1.08066 3.783112 ------------------------------------------------------------------------------
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4L 5GIGI !4F5G *+, 562"78 9:++ !D -(A7"8?% 9VV . glm low smoke, family(binomial) eform Iteration 0: log likelihood = -115.10394 Iteration 1: log likelihood = -114.90246 Iteration 2: log likelihood = -114.9023 Iteration 3: log likelihood = -114.9023 Generalized linear models No. of obs = 189 Optimization : ML Residual df = 187 Scale parameter = 1 Deviance = 229.8045995 (1/df) Deviance = 1.228902 Pearson = 189 (1/df) Pearson = 1.010695 Variance function: V(u) = u*(1-u) [Bernoulli] Link function : g(u) = ln(u/(1-u)) [Logit] AIC = 1.237061 Log likelihood = -114.9022998 BIC = -750.4021 ------------------------------------------------------------------------------ | OIM
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