The Effect of Vitamin C on Tooth Growth in Guinea Pigs

ToothGrowth

Format

A data.frame with 60 rows and 6 variables

ID

integer

ID of the guinea pig
supp

factor

Supplement type (VC: Vitamin C or OJ: Orange juice)
supp2

factor

Transformation of the supplement type (factor to numerical: VC = 1; OJ = 2)
dose

numeric

Dose in grams / day
dose2

ordered factor

Dose in grams / day
len

numeric

Tooth length
logLen

numeric

Natural logarithm of the tooth length (len)