An ingenious regression analysis was reported in which the effects of the 1985 French banking deregulation were assessed. Bank equity was the dependent variable, and each data point was a tax return for a particular quarter and bank in France from 1978 to the time the research was done. This resulted in 325,928 data points, assumed a random sample. The independent variables were Bankdep-average debt in the industry during this period; ROA-the given ?rm's average return on assets for the entire period, and After-0 before 1985, and 1 after 1985. The variables used in this regression were all cross-products. These variables and their coefficient estimates (with their standard errors) are given below.
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After * Bankdep
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-0.398 (0.035)
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After * Bankdep * ROA
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0.155 (0.057)
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After * ROA
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-0.072 (0.024)
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Bankdep * ROA
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-0.286 (0.073)
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The adjusted R 2 was 53%.19 Carefully analyze these results and try to draw a conclu- sion about the effects of the 1985 French Banking Deregulation Act.