The aphids data frame has 51 rows and 2 columns. These
correspond to 51 independent experiments in which varying numbers of
aphids were released in a flight chamber containing 12 infected and
69 healthy tobacco plants. The resulting number of infected plants
(amongst those previously healthy) was recorded.
data(aphids)This data frame contains the following columns:
n.aphidsthe number of aphids released in the flight chamber in each instance
n.infthe resulting number (out of a possible 69) of infected plants
After 24 hours, the flight chamber was fumigated to kill the aphids, and the previously healthy plants were moved to a greenhouse and monitored to detect symptoms of infection. The number of plants displaying such symptons was recorded.
Boiteau, G., M. Singh, R. P. Singh, G. C. C. Tai, and T. R. Turner (1998). Rate of spread of PVY-n by alate Myzus persicae (Sulzer) from infected to healthy plants under laboratory conditions. Potato Research, vol. 41, pp. 335 -- 344.