Story Name: Mexico City Effect

Abstract: This dataset contains the gold medal performances in the men's long
jump, high jump and discus throw for the modern Olympic games from 1900 to 1984.
Data are also provided for the 1896 Olympics, but one may wish to omit them from
the analyses because that Olympics was quite different from later ones.

It has been suggested that the Mexico City Olympics in 1968 saw unusually good
track and field performances, possibly because of the high altitude. To
investigate this question we must establish some expected performance level.
Scatterplots of each variable vs year show fall-off of performance with each of
the two World Wars of the 20th century. It may, therefore, be best to fit a
regression only to recent (post WWII) olympics. The long-jump records in
particular show a remarkable performance in 1968.


Reference: This data is distributed with the software package, Data Desk¨. Data
Description, Inc. (1993). Data Desk¨. Ithaca, NY: Data Description, Inc.
Authorization: free use Description: Gold Medal performance in several Track and
Field events. The gold medal performance in the men's long jump, shot put, and
high jump (measured in inches) for the modern Olympic series starting in 1900.

The Olympics in 1896 are included for reference but made missing for standard
analyses. Number of cases: 20 Variable Names:

1.high_jump: Height of the high jump (inches)
2.Discus_Throw: Distance of the throw (inches)
3.long_jump: Distance of the jump (inches)
4.year: Year of the Olympics

The Data:

high_jump Discus_Throw long_jump year
71.25 1147.5 249.75 -4
74.8 1418.9 282.875 0
71 1546.5 289 4
75 1610 294.5 8
76 1780 299.25 12
76.25 1759.25 281.5 20
78 1817.125 293.125 24
76.375 1863 304.75 28
77.625 1948.875 300.75 32
79.9375 1987.375 317.3125 36
78 2078 308 48
80.32 2166.85 298 52
83.25 2218.5 308.25 56
85 2330 319.75 60
85.75 2401.5 317.75 64
88.25 2550.5 350.5 68
87.75 2535 324.5 72
88.5 2657.4 328.5 76
92.75 2624 336.25 80
92.5 2622 336.25 84