COVID-19 and the beef market in Latin America: An impact assessment by supply and demand.

Front Public Health · 2022 · PMC9720381 · PMID 36478714

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a clear trendno p-value reported

It assumes that for the estimator to be effectively unbiased and to show the effect only of the intervention being evaluated, there must not be a time trend in the outcome variable, that is, the outcome variable cannot have a clear trend over time that can be confused with the results of the intervention.

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