# ORinv: Odds Ratio of two groups with strata by inverse variance... In sasLM: 'SAS' Linear Model

 ORinv R Documentation

## Odds Ratio of two groups with strata by inverse variance method

### Description

Odds ratio and its score confidence interval of two groups with stratification by inverse variance method

### Usage

``````  ORinv(d0, conf.level=0.95)
``````

### Arguments

 `d0` A data.frame or matrix, of which each row means a stratum. This should have four columns named y1, n1, y2, and n2; y1 and y2 for events of each group, n1 and n2 for sample size of each strata. The second group is usually the control group. `conf.level` confidence level

### Details

It calculates odds ratio and its confidence interval of two groups by inverse variance method. This supports stratification. This can be used for meta-analysis also.

### Value

The following output will be returned for each stratum and common value. There is no standard error.

 `odd1` odd from the first group, y1/(n1 - y1) `odd2` odd from the second group, y2/(n2 - y2) `OR` odds ratio, odd1/odd2. The point estimate of common OR is calculated with MH weight. `lower` lower confidence limit of OR `upper` upper confidence limit of OR

### Author(s)

Kyun-Seop Bae k@acr.kr

`RDmn1`, `RRmn1`, `ORmn1`, `RDmn`, `RRmn`, `ORmn`, `RDinv`, `RRinv`, `ORcmh`
``````  d1 = matrix(c(25, 339, 28, 335, 23, 370, 40, 364), nrow=2, byrow=TRUE)