R: Ohio Children Wheeze Status

ohio {geepack} | R Documentation

## Ohio Children Wheeze Status

### Description

The `ohio` data frame has 2148 rows and 4 columns. The dataset is a subset of the six-city study, a longitudinal study of the health effects of air pollution.

### Usage

    data(ohio)

### Format

This data frame contains the following columns:

resp

  an indicator of wheeze status (1=yes, 0=no)

id

  a numeric vector for subject id

age

  a numeric vector of age, 0 is 9 years old

smoke

  an indicator of maternal smoking at the first year of the study

### References

Fitzmaurice, G.M. and Laird, N.M. (1993) A likelihood-based method for analyzing longitudinal binary responses, Biometrika 80: 141–151.

### Examples

    data(ohio)
    fit <- geese(resp ~ age + smoke + age:smoke, id=id, data=ohio,
                 family=binomial, corstr="exch", scale.fix=TRUE)
    summary(fit)
    fit.ar1 <- geese(resp ~ age + smoke + age:smoke, id=id, data=ohio,
                     family=binomial, corstr="ar1", scale.fix=TRUE)
    summary(fit.ar1)

[Package geepack version 1.2-1 Index]