Question: The coefficient on the time trend in Table 1, Panel A, Column (2) is positive. The positive coefficient means that after controlling for cumulative production

The coefficient on the time trend in Table 1, Panel A, Column (2) is positive. The positive coefficient means that after controlling for cumulative production there is a slight positive increase in defects over time. But Figure 1 and Part 4 show a strong and clear negative association between average defects per car and the time trend. Why is there a big discrepancy

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