Original variables* | Description of cross-classification | Predictor variable ID | Farm frequency |
---|---|---|---|
House count/ Bird count | house count = small, bird count = small | hbSS | 128 |
 | house count = small, bird count = large | hbSL | 53 |
 | house count = large, bird count = small | hbLS | 50 |
 | house count = large, bird count = large | hbLL | 117 |
Indoor/ Free-range | indoor = no, free-range = no | ifNN | 26 |
 | indoor = no, free-range = yes | ifNY | 79 |
 | indoor = yes, free-range = no | ifYN | 229 |
 | Indoor = yes, free-range = yes | ifYY | 14 |