# matchTab: Matched tabulation In epiDisplay: Epidemiological Data Display Package

## Description

Tabulation of outcome vs exposure from a matched case control study

## Usage

 `1` ```matchTab (case, exposed, strata, decimal) ```

## Arguments

 `case` Outcome variables where 0 = control and 1 = case `exposed` Exposure variable where 0 = non-exposed and 1 = exposed `strata` Identification number for each matched set `decimal` Number of digits displayed after the decimal point

## Details

Tabulation for an unmatched case control study is based on individual records classified by outcome and exposure variables.

Matched tabulation is tallying based on each matched set. The simplest form is McNemar's table where only one case is matched with one control. 'matchTab' can handle 1:m matching where m can vary from 1 to m. A MLE method is then used to compute the conditional odds ratio.

## Author(s)

Virasakdi Chongsuvivatwong <[email protected]>

'table', 'cc' and 'clogit'

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16``` ```.data <- infert ## Not run: # matchTab(case, induced, stratum) # Tabulation successful but OR not computed # because 'induced' is not binary ## End(Not run) attach(.data) ia <- induced > 0 # any induced abortion matchTab(case, ia, stratum) # See also clogit(case ~ ia + strata(stratum), data=infert) detach(.data) rm(list=ls()) ```

### Example output

```Loading required package: foreign

Exposure status: ia = TRUE

Total number of match sets in the tabulation = 83

Number of controls = 1
No. of controls exposed
No. of cases exposed 0 1
0 1 0
1 0 0

Number of controls = 2
No. of controls exposed
No. of cases exposed  0  1  2
0 20 19  7
1 12 12 12

Odds ratio by Mantel-Haenszel method = 1.091

Odds ratio by maximum likelihood estimate (MLE) method = 1.094
95%CI= 0.609 , 1.966

Call:
clogit(case ~ ia + strata(stratum), data = infert)

coef exp(coef) se(coef)   z    p
iaTRUE 0.0897    1.0939   0.2991 0.3 0.76

Likelihood ratio test=0.09  on 1 df, p=0.764
n= 248, number of events= 83
```

epiDisplay documentation built on May 11, 2018, 1:04 a.m.