The Effect of Vitamin C on Tooth Growth in Guinea Pigs

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)