VII. DISCUSSION OF THE DATA OF STATURE. 129

four brothers, and therefore giving an increased weight to those Fraternities, but in other respects the system was hardly objectionable. The introduced error must be so slight as to make it scarcely worth while now to go over the work again. By the system adopted, I found the Prob. Difference to be 1.55, which divided by V 2 gives b =1.10 inch.

Thus far we have dealt with the special data only. The less trustworthy R.F.F. give larger values of 6 in every case. An epitome of all the results appears in the following table

Methods and data. |
Values of b obtained by different methods and from different data. | |

From Special Data. |
From R.F.F. data? | |

(1) From Fraternities each containing the same number of |
||

persons |
1.07 |
1.38 |

(2) From the mean value of Fraternal Regression |
0.95 |
1.31 |

(3) From the Variability of Fraternal Regression |
1.10 |
1.14 |

(4) From Pairs of Brothers taken at random |
1.10 |
1.35 |

Mean |
1.06 |

The data used in the four methods are somewhat different.. In (1) I could not deal with small Fraterni

The The R.F.F. results were obtained from brothers only and not from transmuted sisters, except in method (2), where the paucity of the data compelled me to include them.

K