This data gives the mean percentage of butterfat produced by different Canadian pure-bred diary cattle. There are five different breeds and two age groups, two years old and greater than five years old. For each combination of breed and age, there are measurements for 10 cows.
该数据给加拿大由不同的纯种奶牛的乳脂的平均百分比。有五种不同的品种和两个年龄组,2岁和大于5岁。品种和年龄的每一种组合中,有10头母牛的测量。
用法----------Usage----------
data (butterfat.df)
格式----------Format----------
A data frame with 100 observations on 3 variables.
有100个观测3个变量的数据框。