Lecture 14: Multiple Comparison Procedures

We went over the problem of making multiple comparisons with one data set.

We discussed the ideas behind the Bonferoni Correction, as well as Tukey's, Fisher's, Dunnett's, and Hsu's methods.

The following data are taken from Carnegie Mellon's StatLib Data and Story collection: http://lib.stat.cmu.edu/DASL/Stories/cuckoo.html.
The data are the length of Cuckoo eggs found in the nests of other species.

Host_Species	Length
Meadow_Pipit	19.65
Meadow_Pipit	20.05
Meadow_Pipit	20.65
Meadow_Pipit	20.85
Meadow_Pipit	21.65
Meadow_Pipit	21.65
Meadow_Pipit	21.65
Meadow_Pipit	21.85
Meadow_Pipit	21.85
Meadow_Pipit	21.85
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.05
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.25
Meadow_Pipit	22.45
Meadow_Pipit	22.45
Meadow_Pipit	22.45
Meadow_Pipit	22.65
Meadow_Pipit	22.65
Meadow_Pipit	22.85
Meadow_Pipit	22.85
Meadow_Pipit	22.85
Meadow_Pipit	22.85
Meadow_Pipit	23.05
Meadow_Pipit	23.25
Meadow_Pipit	23.25
Meadow_Pipit	23.45
Meadow_Pipit	23.65
Meadow_Pipit	23.85
Meadow_Pipit	24.25
Meadow_Pipit	24.45
Tree_Pipit	21.05
Tree_Pipit	21.85
Tree_Pipit	22.05
Tree_Pipit	22.45
Tree_Pipit	22.65
Tree_Pipit	23.25
Tree_Pipit	23.25
Tree_Pipit	23.25
Tree_Pipit	23.45
Tree_Pipit	23.45
Tree_Pipit	23.65
Tree_Pipit	23.85
Tree_Pipit	24.05
Tree_Pipit	24.05
Tree_Pipit	24.05
Hedge_Sparrow	20.85
Hedge_Sparrow	21.65
Hedge_Sparrow	22.05
Hedge_Sparrow	22.85
Hedge_Sparrow	23.05
Hedge_Sparrow	23.05
Hedge_Sparrow	23.05
Hedge_Sparrow	23.05
Hedge_Sparrow	23.45
Hedge_Sparrow	23.85
Hedge_Sparrow	23.85
Hedge_Sparrow	23.85
Hedge_Sparrow	24.05
Hedge_Sparrow	25.05
Robin	21.05
Robin	21.85
Robin	22.05
Robin	22.05
Robin	22.05
Robin	22.25
Robin	22.45
Robin	22.45
Robin	22.65
Robin	23.05
Robin	23.05
Robin	23.05
Robin	23.05
Robin	23.05
Robin	23.25
Robin	23.85
Pied_Wagtail	21.05
Pied_Wagtail	21.85
Pied_Wagtail	21.85
Pied_Wagtail	21.85
Pied_Wagtail	22.05
Pied_Wagtail	22.45
Pied_Wagtail	22.65
Pied_Wagtail	23.05
Pied_Wagtail	23.05
Pied_Wagtail	23.25
Pied_Wagtail	23.45
Pied_Wagtail	24.05
Pied_Wagtail	24.05
Pied_Wagtail	24.05
Pied_Wagtail	24.85
Wren	19.85
Wren	20.05
Wren	20.25
Wren	20.85
Wren	20.85
Wren	20.85
Wren	21.05
Wren	21.05
Wren	21.05
Wren	21.25
Wren	21.45
Wren	22.05
Wren	22.05
Wren	22.05
Wren	22.25