Results of an experiment where two groups of 16 female rats were fed
different diets during pregnancy and lactation periods. One group's diet
contained a chemical under review, and the other one was a control. For each
litter, the number of pups alive at 4 days, and the number of pups weaned
(i.e. that survived the 21-day lactation period) were recorded.
A data frame with 32 rows and 3 variables:
| [, 1] | group | Either control or treated group. |
| [, 2] | i | Pups weaned. |
| [, 3] | n | Pups alive at 4 days. |
Source
Weil CS. 1970. Selection of the valid number of sampling units and a
consideration of their combination in toxicological studies involving
reproduction, teratogenesis or carcinogenesis. Food and Cosmetics
Toxicology 8: 177-182.
