airpc {sm}

These data list the first two principal component scores from the aircraft data, which record six characteristics of aircraft designs throughout the twentieth century

Description

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:

Comp.1:	first principal component score
Comp.2:	second principal component score
Yr:	year of first manufacture
Period:	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.