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When I performed logistic regression and generated a confidence interval of the odds ratio with R using confint, it gave a different confidence interval than the one generated in SPSS. However, when I use confint.default in R instead, the confidence intervals were the same as those generated in SPSS. Can someone explain why I am getting different confidence intervals from SPSS vs R with confint and confint.default?

Gaukulius
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  • confint.default uses "asymptotic normality" while confint is a generic method which uses more appropriate calculation for your particular model, if it exists. Can you show a small toy example with inputs, code and outputs, which we can reproduce? – Henry Jul 27 '22 at 14:25
  • You might want to look at https://stats.stackexchange.com/questions/5304/why-is-there-a-difference-between-manually-calculating-a-logistic-regression-95 and the questions linked to it – Henry Jul 27 '22 at 14:27

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