data(byssinosis)
[,1] | dust |
Factor w/ 3 levels "most","less" | [,2] |
race | Factor w/ 2 levels "white","non-white" |
[,3] | sex |
Factor w/ 2 levels "male","female" | [,4] |
smok | Factor w/ 2 levels "smoker","non" |
[,5] | emp |
Factor w/ 3 levels "<10","10-20",...< td=""> | [,6] | 10","10-20",...<>
yes | int, Number of workers who suffered byssinosis |