Damage of two gaseous substances on nasal mucosa membrane of mice
data(nms)
A data frame with 150 rows and 3 variables:
The substance given, either 1 or 2
the concentration in which the substance was given, 1, 2 or 5 ppm
degree of irritation assessed using an ordinal score ranging from 0 to 4 with 0 = <U+201C>no irritation<U+201D>, 1 = <U+201C>mild irritation<U+201D>, 2 = <U+201C>strong irritation<U+201D>, 3 = <U+201C>severe irritation<U+201D> and 4 = <U+201C>irreversible damage<U+201D>