Description Usage Arguments Details Author(s) See Also Examples

Tabulation of outcome vs exposure from a matched case control study

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

`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 |

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.

Virasakdi Chongsuvivatwong <[email protected]>

'table', 'cc' and 'clogit'

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())
``` |

```
Loading required package: foreign
Loading required package: survival
Loading required package: MASS
Loading required package: nnet
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.

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