How useful is Okun's law?

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Okun's Law: Fit at Fifty? (2013, background): “No year is a major outlier in the graphs.3 Some economists suggest that Okun’s Law is non-linear, with different unemployment effects of increases and decreases in output (for example, Knotek, 2007).”
Economic growth and unemployment issue: Panel data analysis in Eastern European Countries (2018, methodology): “Knotek II (2007) tested the United States for the period 1948-2007 with Cointegration Analysis.”