These data list the first two principal component scores from the aircraft data, which record six characteristics of aircraft designs throughout the twentieth century.
The variables are:
||first principal component score|
||second principal component score|
||year of first manufacture|
||a code to indicate one of three broad time periods|
The data were collected by P. Saviotti and are described in detail in Saviotti (1996), "Technological Evolution, Variety and Economy", Edward Elgar: Cheltenham.
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