The 'frets' data frame has 25 rows and 4 columns.
“音品”的数据框具有25行和第4列。
The data consist of measurements of the length and breadth of the heads of pairs of adult brothers in 25 randomly sampled families. All measurements are expressed in millimetres.
这些数据包括测量的长度和宽度对成年兄弟的头25个随机抽样的家庭。所有的测量都以毫米为单位表示。
用法----------Usage----------
data(frets)
格式----------Format----------
This data frame contains the following columns:
该数据框包含以下几列:
l1 The head length of the eldest son.
L1的头长的长子。
b1 The head breadth of the eldest son.
B1头宽的长子。
l2 The head length of the second son.
L2的头部长度的第二个儿子。
b2 The head breadth of the second son.
B2的第二个儿子的头宽。
源----------Source----------
Frets, G.P. (1921) Heredity of head form in man. Genetica, 3, 193.
音品,G.P. (1921)遗传在人的头型。遗传学,3,193。