This was his concept of pattern prediction, or explanation of the principle, broad, general predictions.
Hayek's Journey: The Mind of Friedrich Hayek (2003)
“Hayek did not believe that the same sort of prediction—and therefore control—that is possible in the natural sciences is attainable in the realm of society. At best, he thought, only a “pattern” of the future can be predicted in social life. He thought that to attempt to formulate laws of societal development akin to the laws of the physical sciences, as Marx attempted, is doomed to failure.”
Hayek's Journey: The Mind of Friedrich Hayek (2003)
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Alan O. Ebenstein 47
American political scientist, educator and author 1959Related quotes

salaries and material conditions on the job
Henri Lefebvre (1970/2003) The Urban Revolution p. 110.
Variant:
Marx... conceived of a path, not a model.
As cited in: "Anti-Capitalist Meet Up: Henri Lefebvre looks out into space" at dailykos.com, 2012.04.29
Other quotes
Source: A History of Economic Thought (1939), Chapter VI, Marx, p. 295
Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), p. 65
Hayek's Journey: The Mind of Friedrich Hayek (2003)
Hayek's Journey: The Mind of Friedrich Hayek (2003)

Source: The Best That Money Can't Buy: Beyond Politics, Poverty, & War (2002), p. 72

Introduction, Lesson I: Definition and Sphere of the Science.
Elementary Lessons on Logic (1870)