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- R requires the table in this format:
Explanatory
variable ⇓ | Response variable ⇓ |
| − | + |
| Reference | 800 | 3 |
| + | 17 | 1 |
- tabodds = matrix(c(800,17,3,1),nc=2) enters the table column by column into the variable 'tabodds'.
- nc = 2 instructs R that there are two columns.
- oddsratio.wald specifies the unconditional maximum likelihood estimate of the odds ratio and the normal approximation (Wald) confidence interval.
- oddsratio.fisher specifies the conditional maximum likelihood estimate of the odds ratio and the exact confidence interval.
- oddsratio.midp specifies the median unbiased estimate of the odds ratio and the mid-p exact confidence interval.
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