data("Bollen")y1y2y3y4y5y6y7y8x1x2x3sem package (in turn, via pers. comm Bollen to Fox)Bollen, K. A. (1979). Political democracy and the timing of development. American Sociological Review, 44, 572-587.
Bollen, K. A. (1980). Issues in the comparative measurement of political democracy. American Sociological Review, 45, 370-390.
Bollen, K. A. (1989). Structural equation models. New York: Wiley-Interscience.
data(Bollen)
str(Bollen)
plot(y1 ~ y2, data = Bollen)
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