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Empirical accounting research frequently makes use of data sets with a time-series a cross-sectional dimension – a panel of data. The literature review indicates that African researchers infrequently allow for heterogeneity between firms when panel data and the empirical example shows that regression results that allow firm heterogeneity are materially different from regression results that assume among firms. The econometric analysis of panel data has advanced in recent years and accounting researchers should benefit from those .
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Phillip de Jager (2008) studied this question.
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